Why you need to regularly fill in brake fluid
All working fluids in the car have their own resource, after which replacement is required. Each vehicle manufacturer in the operational documentation indicates the recommended terms of service and replacement. There are various myths about TJ, common among both novice car enthusiasts and experienced drivers. Let’s take a look at some of them.
Absolute tightness of the brake system. This opinion is fundamentally wrong, since there are technological holes in the system through which air moves. Together with air, water molecules enter the TJ and accumulate in it, due to which the properties of the liquid are lost.
Mixing of liquids from different manufacturers is allowed. There are certain peculiarities in this matter. Manufacturing standards and chemical formulations may vary and may be tailored to specific vehicle models. Mixing is allowed if absolutely necessary, but experts insist that it is better to fill in a completely new TJ.
It is allowed to fill in various fluids of the DOT-4 standard. As mentioned in the previous paragraph, there are differences in the compositions and properties of tAs. You should not experiment if you do not have the necessary knowledge in this area, it is enough to follow the recommendations of the manufacturer of your car, fill in compatible TJs and observe the replacement intervals.
How to choose brake fluid
In order to figure out which brake fluid to fill, you need to know what types there are and what parameters you need to pay attention to. There are three types of TJ basis, consider them:
- Mineral base. Its main technical characteristics are: low aggressiveness of the composition (in relation to rubber seals), good lubricating properties, but at the same time a low operating temperature range (non-frost-resistant, boils at low temperatures). Relatively low cost, it is not recommended to fill in modern cars.
- Synthetic base (contains polyglycols and ethers). This type is most often used as it has good performance properties. The negative qualities of this type of base include a high level of water absorption, which subsequently leads to internal corrosion of the brake system.
- Synthetic base (contains silicone). This type of TG is one of the most expensive. It has a very low level of water absorption, but is quite aggressive towards rubber components. It is also strictly forbidden to fill in together with other types of tAs.
A large number of tAs manufacturers are represented on the market today. When choosing, it is very important that the properties and technical parameters of the fluid meet the necessary requirements, since the safety of the driver and passengers depends on this. So, what parameters should you pay attention to first of all?
- Temperature characteristic
During the operation of the brake system, a sufficiently high pressure is created inside, due to which the working fluid begins to heat up. The boiling point of the TFA is extremely important, since when the liquid boils, the consequences can be dire. Initially, the boiling point is around 250 ° C, but during operation this value begins to drop. The minimum permissible temperature threshold is 165 ° C and occurs after about two years of operation.
- PH level
This characteristic indicates the level of activity of hydrogen ions. The optimum value should be between 7 and 11.5 pH. At a lower value, the medium is acidic and begins to corrode the steel elements of the brake system. If the pH level rises, the composition becomes alkaline, non-ferrous metals and rubber seals are corroded.
The viscosity value should have the smallest dependence on temperature, since a change in this parameter affects the efficiency of the braking system. At low temperatures, the fluid begins to thicken, in this state it becomes extremely difficult for it to pass through the narrow section of the brake pipes. The viscosity is measured in mm 2 / s, on all packages it is customary to indicate the viscosity at.40 ° C, so, for example, for DOT 4 this value should not exceed 1800 mm 2 / s, for DOT 6. 750 mm 2 / s, but for cold regions, this figure should not be lower than 900.
The characteristics listed above allow you to choose a TJ of a sufficiently high quality, but there is no guarantee that the parameters stated on the package correspond to reality. In order not to pour a low-quality product into your car and to avoid negative consequences during operation, get acquainted with the results of a comparative analysis of several manufacturers. The best products are listed below.
- Castrol is a brake fluid manufactured by BP Europe. It has excellent viscosity-temperature characteristics and even has an overestimated margin of values. The only drawback is the lack of a sealed valve on the neck.
- Hi-Gear HG7044. Manufactured in America by Hi-GearProducts. As with the previous model, all characteristics of the liquid meet the standards, although there is no the same temperature safety margin.
- PentosinSuper is a manufacturer of DeutschePentosin-Werke, Germany. ТЖ fully complies with standards, is recommended for use in regions with very cold climates, can be poured at temperatures below.40 ° С.
- Mobil. Produced in Europe by ExxonMobilLubricants Specialties. In terms of its performance, it is not inferior to the above models, but it does not have a hermetic sealing of the packaging neck, that is, there is a risk of water vapor penetration.
- LUXE GreenLine is already Russian-made TJ, the DelfinGroup company. Also recommended for use, all parameters correspond to the standard, so you can safely fill in your car.
- SINTEC Euro is another Russian-made model from the Obninskorgsintez company. The product is of very good quality, the actual values of the physical and chemical properties of the tAs exceed the standards.
- ROSDOT 4 LifeSafety. the last copy in the review, is also produced in Russia by Tosol-Sintez-Invest. Deservedly takes a place in the list of recommended brake fluids.
How to fill in brake fluid: choose a brand and follow the rules
- Why you need to fill in brake fluid
- When to fill with brake fluid
- What kind of brake fluid needs to be filled
- How to fill in brake fluid
What is brake fluid for? Its only function is to transfer force from the brake pedal to the brake cylinders of each wheel. The brake cylinders act on the pads and there is a frictional force between the pads and the brake disc (drum). Every car owner should know how to fill in brake fluid, as this is the key to the safety and smooth operation of the system.
How often to fill in brake fluid
It has already been said above that all the regulations for the maintenance of your vehicles, as well as the timing of the replacement of working fluids, are indicated by the vehicle manufacturer. If we talk about the replacement interval, on average it is 40-60 thousand kilometers, or 2-3 years of vehicle operation. It is recommended to focus specifically on the information in your manual, and not on the one indicated by the manufacturer on the packaging.
Numbers on the label can be a marketing tool for an unscrupulous manufacturer to attract buyers.
Do not exceed the recommended timeframes, and if the car is actively used, it is better to fill in fresh TJ more often. This procedure is quite inexpensive, and if performed independently, it becomes even cheaper.
Each car owner should know where to fill the brake fluid in his car, and before going on the road, he should definitely assess the external condition of the TJ, the color and level in the expansion tank, and top up the TJ if necessary. A sharp decrease in the level indicates that there is a leak in the system, a rupture of brake hoses, pipelines, wear of the seal in the brake cylinders is possible.
If a malfunction is found, the operation of the vehicle is strongly discouraged, it is necessary to eliminate the cause of the leak and it is advisable to fill in a new TJ, since dirt could get into the system through the place of the gust.
The condition of the TJ is also monitored when performing a technical inspection of the car, when the oils are changed and minor-urgent repairs are performed, most often this procedure occurs in the off-season.
The expansion tank has minimum and maximum levels that indicate how much brake fluid to fill. It is very important to adhere to this range, do not allow the level to fall below and do not overflow above the indicated marks. Failure to observe this point may result in airing of the system or overflow of excess fluid through the expansion tank valve. When traveling long distances, it is advisable to have a small supply of TAS in the car so that, if necessary, you can fill in the missing amount.
How to fill in brake fluid
As soon as the regulated period of replacement of the brake fluid approaches or when a significant deviation of the properties from the recommended parameters is revealed, the question arises of filling in a new fluid. The easiest and fastest option is to contact any service station and entrust the matter to specialists. This procedure will not take much time, and the cost of work will be relatively low.
If you do not want to pay for such a simple work at all, then you can perform the procedure for replacing the TJ on your own, usually the replacement process does not cause any difficulties. All that is required for this is to carefully study the step-by-step instructions, because many do not even know how to fill in the brake fluid correctly, stock up on the necessary set of tools, purchase TJ in advance, and one assistant is definitely needed.
Before starting work, you should first make sure that it is necessary to replace the TJ, which will require a special tester. This device measures the boiling point of the working fluid and displays the corresponding indicator. For example: a boiling point above 175 ° C indicates a satisfactory condition, with a value from 165 to 175 ° C, operation is also allowed, but if the temperature is below 165 ° C, an urgent need to fill in a new fluid.
In addition to measuring with a tester, a visual inspection should be performed. In terms of color and consistency, the TFA should correspond to the initial state, the presence of finely dispersed suspensions, as well as turbidity of the liquid, indicates wear of any elements of the brake system or precipitation of some chemical components. The detection of such symptoms indicates that an urgent need to fill in a new TAS.
As mentioned above, the replacement process is completely simple, but requires some attention and caution. It is imperative to take care of personal protective equipment in advance, TJ is very aggressive and, if it gets on open areas of the skin and mucous membranes, can cause a chemical burn.
The procedure will take approximately 1 hour to complete. Below is a list of what you will definitely need to get started:
- spanner key 10;
- protective goggles for the eyes;
- rubber gloves;
- long-sleeved jacket;
- clean rags;
- container for draining spent TZH;
- a small amount of clean water;
- rubber hose or hose from a dropper;
- new brake fluid (take with a margin);
- inspection pit or overpass.
Now let’s talk about the process of replacing TJ itself, it consists of the following points:
- We drive into the inspection pit in such a way that each wheel is accessible from the pit.
- We turn off the engine and put the selector lever of the car in the neutral position, put “shoes” under the wheels to avoid rolling back the car.
- Open the hood and unscrew the expansion tank cap on the brake master cylinder.
- We remove any wheel, for this, first we rip off the bolts, then we install the jack and raise the car, after which we completely remove the wheel.
- We take rags, clean water and thoroughly clean the area around the drain valve on the wheel hub.
- We put on a hose on the valve fitting, lower the second end into the prepared container for testing, with a 10 key we tear off the valve screw from its place and cover it by hand.
- The second person begins to pump the brake pedal, about four strokes, the fifth pedal is fixed in the pressed position. At this moment, you need to open the valve, the old liquid will begin to drain into the container.
- As soon as the TZ has stopped flowing, we immediately close the valve, otherwise there is a possibility of airing the system.
- After the level of the TAS in the expansion tank drops to the lower mark, it is necessary to fill in a new liquid, continuing to drain according to the same principle. We drain until a pure TZ flows from the hose.
- Next, tighten the valve screw, put the wheel in place and go to the next wheel, which is located diagonally (required).
- We repeat the above procedures for each wheel, at the end of work, the brake pedal should move smoothly, be clearly fixed in the extreme upper position and should not sink deeply in the lower position. If this does not happen, you will have to pump each circuit in a new way.
- After completing all the work, we check the tightness of each valve and the presence of protective rubber caps, also do not forget to stretch all four wheels.
- If necessary, add liquid to the maximum mark, close the lid and hood. Checking the operation of the brake system on the go.
Subject to all the points of the specified list, filling the TJ will not be difficult even for a novice motorist.
What kind of fluid to fill in the bike brakes
Replacing the brake fluid and bleeding the brakes
Brakes from different manufacturers are structurally very different from each other, therefore, the recommendations for the use of brake fluid are also very different.
Always read the manufacturer’s instructions before servicing your bike‘s brakes.!
In particular, the differences relate to the recommended brake fluid. For example, Shimano produces a special mineral oil for its brakes, and only this oil can be used in all models of the hydraulic brakes of this company. Hope recommends using DOT 4 or DOT 5.1 automotive brake fluid.
Quite stringent requirements are imposed on brake fluid:
- It must not corrode the metals from which the brake parts are made, and must not destroy oil seals and seals.
- It shouldn’t thicken in the cold.
- It should not expand much when heated (and the disc brake caliper can heat up to very high temperatures during prolonged braking).
- It should not boil when heated (brake failure on long descents is most often associated with heating the brake parts and subsequent boiling of the brake fluid)
- It must be able to chemically bind water that enters it (water in the hydraulic system of the brakes not only causes corrosion, but can also boil when the caliper heats up).
Sooner or later, water will enter the hydraulic system anyway, and the ability of the brake fluid to bind this water is limited. Therefore, the brake fluid must be replaced periodically. Usually this does not have to be done often. once every few years.
Changing the brake fluid is described using the example of Shimano 525 brakes.
Checking the condition of the brake fluid
The SHIMANO mineral oil has a bright red color, which fades over time and becomes discolored. The brake fluid should be changed when it loses color, becomes pale pink
It is necessary to remove the cap from the expansion tank once a year and check the condition of the brake fluid.
Checking the condition of the brake fluid
We loosen the screws securing the brake lever to the steering tube.
2. Turn the brake lever so that the expansion tank takes a horizontal position.
Unscrew two screws and remove the cover from the expansion tank.
4. Carefully remove the rubber membrane.
For replacement, you will need, in addition to screwdrivers and keys, a piece of PVC tube 30-40 cm long (preferably translucent or transparent) and a bowl for the waste fluid. It is convenient to pour brake fluid into the expansion tank from a medical syringe.
It is better to do the work not in the apartment, but somewhere in the barn, or in the garage. it can get very dirty if you do something wrong.
The best way to change the brake fluid is to remove the brake caliper from the bike. In this case, there is no need to be afraid of the brake fluid getting on the disc and pads. In addition, the brakes are easier to bleed when the brake lines are vertical. Place some kind of solid spacer between the brake pads (a piece of cardboard or plastic the same thickness as the brake disc)
Drain the old brake fluid.
We put a tube on the valve located on the caliper, direct the other end of the tube into the basin.
When the old fluid stops pouring out, proceed to filling the hydraulic system.
Fill in new brake fluid and pump the brakes.
Pour the brake fluid into the expansion tank to the brim. (You can use a medical syringe)
Press the brake lever several times. At the same time, air bubbles rise into the expansion tank, and the level of the brake fluid in the tank decreases. it passes into the hydraulic line. As the fluid level in the reservoir decreases, it is necessary to add new brake fluid there, preventing the reservoir from completely emptying. In order for air bubbles to rise up to the expansion tank, you can periodically lightly tap the caliper and hydraulic lines with your fingers.
At the same time we look at the tube extending from the caliper. When the brake line and caliper are full, brake fluid will start pouring out of this tube into the basin. (The caliper and expansion tank are communicating vessels)
Close the valve on the caliper with a key.
Check that there are no air bubbles left in the hydraulic line.
Make sure a gasket is inserted between the brake caliper pads.
We press the brake lever. If it is pressed softly, “falls through”, then there are still air bubbles in the hydraulic system. In this case, open the valve, and continue to pour liquid into the tank by pressing the brake lever (go to step 2)
If the handle turns out to be “stiff” and does not reach the steering wheel, then everything is fine. Go to step 6
We close the valve on the caliper with a key, disconnect the tube from it.
Top up the brake fluid expansion tank almost to the brim.
We install a rubber membrane on the tank, screw the lid.
Wipe the brake lever and caliper from the remaining brake fluid.
Return the brake lever to its normal position.
Install the caliper on the frame, adjust its position
Composition and properties of brake fluids
The basis of the chemical composition of most brake fluids is polyglycol (up to 98%), less often manufacturers use silicone (up to 93%). In the brake fluids that were used on Soviet cars, the base was mineral (castor oil with alcohol in a 1: 1 ratio). It is not recommended to use such fluids in modern cars due to their increased kinetic viscosity (thicken at.20 °) and low boiling point (at least 150 °).
The remaining percentages in polyglycol and silicone TK are represented by various additives that improve the characteristics of the brake fluid base and perform a number of useful functions, such as protecting the surfaces of the working mechanisms of the brake system or preventing the oxidation of TK as a result of exposure to high temperatures.
It is not for nothing that we dwelt in detail on the chemical composition of brake fluids used in cars, since many motorists are interested in the question. “is it possible to mix technical specifications with different chemical bases?” We answer: it is strongly not recommended to mix mineral brake fluids with polyglycolic and silicone fluids. From the interaction of the mineral and synthetic bases of these fluids, castor oil clots can form, which clog the brake lines, and this is fraught with brake system malfunctions. If you mix mineral and polyglycolic TK, then this “hellish mixture” will be absorbed into the surface of the rubber cuffs of the brake hydraulic drive parts, which will lead to their swelling and loss of sealing.
Polyglycolic TZ, although they have a similar chemical composition, and can be interchangeable and, but mixing them in one brake system is still not recommended. The fact is that each manufacturer of technical specifications can change the composition of the additives at its discretion, and their mixing can lead to a deterioration in the main operational characteristics of the working fluid. viscosity, boiling point, hygroscopicity (ability to absorb water) or lubricating properties.
Silicone brake fluids must not be mixed with mineral and polyglycolic ones, as as a result, the working medium becomes clogged with precipitated chemicals, which will lead to clogging of the brake system lines and failure of the brake cylinder assemblies.
One of the fluids important for the normal operation of a car is brake fluid. About what this fluid is needed for, how often it needs to be replaced and what kind of brake fluids to use for optimal operation of the machine’s braking system. in our today’s article.
Classification of brake fluids
Today, most countries around the world have uniform brake fluid standards known as DOT (after the name of the agency that developed them. the Department of Transportation. the United States Department of Transportation). such markings are often found on brake fluid containers. It means that the product is manufactured in accordance with the regulatory federal vehicle safety standards FMVSS No. 116 and can be used in the braking systems of cars and trucks, depending on the technical characteristics of these vehicles. In addition to the American standard, brake fluids are labeled in accordance with the standards adopted in a number of European and Asian countries (ISO 4925, SAE J 1703 and others).
But they all classify brake fluids according to two parameters. their kinematic viscosity and boiling point. The first is responsible for the ability of the working fluid to circulate in the brake system line (hydraulic drive, pipes) at extreme operating temperatures: from.40 to 100 degrees Celsius. The second is for preventing the formation of a vapor “plug” that forms at high temperatures and can lead to the brake pedal not being activated at the right time. When classifying TZ by boiling point, two states are distinguished. the boiling point of a liquid without impurities of water (“dry” TZ) and the boiling point of a liquid containing up to 3.5% water (“humidified” TZ). The “dry” boiling point of the brake fluid is determined by a new, freshly poured working fluid, which did not have time to “collect” water and therefore has high performance characteristics. The “humidified” boiling point of TK refers to a working fluid that has been in operation for 2-3 years and contains a certain amount of moisture in its composition. about this. in the section “Service life of brake fluids”. Depending on these parameters, all brake fluids are divided into four classes.
DOT 3. The “dry” boiling point of this brake fluid is not less than 205 °, and the “wet” one is not less than 140 °. The kinematic viscosity of such a TZ at 100 ° is not more than 1.5 mm² / s, and at.40. not less than 1500 mm² / s. The color of this brake fluid is light yellow. Application: intended for use in cars, the maximum speed of which is no more than 160 km / h, in the braking system of which disc (on the front axle) and drum (on the rear axle) brakes are used.
DOT 4. The “dry” boiling point of this brake fluid is at least 230 °, and the “wet” one is at least 155 °. The kinematic viscosity of such a TZ at 100 ° is not more than 1.5 mm² / s, and at.40. not less than 1800 mm² / s. The color of this brake fluid is yellow. Application: intended for use in vehicles with a maximum speed of up to 220 km / h. Disc (ventilated) brakes are installed in the braking system of such cars.
DOT 5. The “dry” boiling point of this brake fluid is not less than 260 °, and the “wet” one is not less than 180 °. The kinematic viscosity of such TZ at 100 ° is not more than 1.5 mm² / s, and at.40. not less than 900 mm² / s. The color of this brake fluid is dark red. Unlike the above TK, DOT 5 is based on silicone, not polyglycol. Application: intended for use on special vehicles operating in conditions of extreme temperatures for braking systems, and therefore is not used on ordinary cars.
DOT 5.1. The “dry” boiling point of this brake fluid is not less than 270 °, and the “wet” one is not less than 190 °. The kinematic viscosity of such a TZ at 100 ° is no more than 1.5 mm² / s, and at.40. no less than 900 mm² / s. The color of this brake fluid is light brown. Application: intended for use in braking systems of sports racing cars in which the temperatures of the working fluids reach critical values.
The role of brake fluid in the “body” of a car
The braking system, which is responsible for the timely stop of the car and therefore plays an important role for the safety of the passengers of the car, cannot work without brake fluid (TK). It is she who performs the main function of the brake system. it transfers through the hydraulic drive the force from pressing the brake pedal to the brake mechanisms of the wheels. pads and discs, as a result of which the car stops. Therefore, even in driving schools, novice motorists are strongly advised to periodically check the levels of four service fluids: engine oil, antifreeze, glass cleaner and brake fluid, on which the optimal operation of the car depends.
Pros and cons of brake fluids
All of the above brake fluids have their own advantages and disadvantages. For convenience, we will indicate them in the table below:
When to change the brake fluid?
The life of the brake fluid directly depends on its chemical composition.
Mineral TK due to its chemical characteristics (low hygroscopicity, good lubricating properties) has a fairly long service life (up to 10 years). But when water enters the liquid, for example, in the event of a depressurization of the brake system, its properties change (the boiling point drops, the viscosity rises), and it can no longer perform its functions, which can lead to brake failure. Periodic inspection (once a year) of the brake system and fluid condition is recommended, which can be determined in laboratory conditions.
Polyglycolic TK has an average or high degree of hygroscopicity. therefore, her condition should be checked twice a year. It is possible to assess the state of polyglycolic TK visually: if the liquid has darkened or precipitation is noticeable in it, then it must be completely replaced. Such TK is capable of absorbing up to 3% moisture per year. If this figure exceeds 8%, then the boiling point of the brake fluid can drop to 100 °, which will lead to boiling of the TK and failure of the entire brake system. Automotive manufacturers recommend changing polyglycol-based brake fluid every 40,000 kilometers or every 2-3 years. Usually such a brake fluid is completely changed during the installation of new external brakes (pads and discs).
Silicone TK is distinguished by its durability of operation, since its chemical composition is more resistant to external influences (moisture ingress). As a rule, replacement of silicone brake fluids is carried out after 10-15 years from the moment of filling in the brake system.
How TJ is poured
Replacing the brake fluid, the procedure is not complicated, but an assistant is required. Of the tools, the key for “8” will come in handy, and there are also specialized ones for bleeding the brakes. Flexible tube, which can easily be pulled over the drain fitting, and a container for draining the liquid. Replacing TZ in Toyota Corolla e150 is performed as follows:
- It is more convenient to work from the overpass. An observation pit is also suitable, and for those who like to lie on the floor, a jack and a wooden block will be enough for insurance;
- Install shoes and other stops so that the car does not accidentally roll;
- It is easy to find the master cylinder, in Toyota Corolla 150 it is located on the right side of the hood, closer to the windshield;
- The easiest way to pump out the old TJ is with a large syringe with a needle or a dropper tube inserted instead of the needle;
- Having emptied the tank of the Corolla 120, you need to go down and unscrew the fittings on the brake cylinders one by one, lower the spent fuel fluid through the tube into the substituted container.
Important: If the waste fluid is thick and has sediment, it is better to flush the system with a special compound or alcohol.
- For flushing, a special substance (or alcohol) is poured into the tank of the master cylinder. The assistant presses the braking pedal in the cab, and from below you drain the fluid from each cylinder in turn until a clean flush goes;
- Having finished the descent and flushing of the system, if necessary, fill the tank of the master cylinder with a new TZ, one pouring liquid into the tank, the replacement in the Corolla TZ does not end.
- The liquid is pumped, in the same way as when flushing, starting from the farthest wheel (to which the longest tubes go);
- The procedure for pumping the Land Cruiser 200 is like any car, first the rear circuit, then the front. With mixed contours, the rear wheel, then the corresponding front wheel, the second rear and the second front;
- In the cabin, the assistant presses the pedal 3-5 times and keeps it pressed;
- At the bottom, unscrew the fitting and lower the TZ, if there are bubbles in it, tighten the fitting, after which the cycle repeats, with the pedal pressed in the cabin;
- This is how the cylinders of all wheels are pumped, do not forget to check the presence of TJ in the reservoir of the master cylinder after pumping each working cylinder. If all the liquid leaves, air will enter the system, and then the replacement of the Corolla 120 TJ starts over;
This completes the replacement of TZ Hilux. It remains to fill the tank of the main cylinder to the level and close its lid.
Mixing of glycol-based lubricants is allowed, provided that the brake fluid added to the system is of the same class or higher than that already filled in the system. That is, topping up DOT-4 into Auris 2007 if it is possible in the DOT-3 system, but on the contrary, it is not desirable. Remember that this will reduce its properties, which means there is a risk of brake failure. It is better to mix liquids from one manufacturer, different manufacturers use different additives. Do not mix glycol and silicone compounds. They are completely incompatible, so the braking system will work poorly, or not work at all.
Note: DOT-5 fluid is recommended for use only in new cars, and a fully functional braking system. It has an extremely low viscosity, leaks occur in old, worn out cylinders such as the 2005 Avensis.
Which one to choose
I will not tell the story of the creation of TJ, and list all the existing and once existed varieties. Because you won’t need it. For Toyota Corolla, and other cars of the famous family, you need to choose from the options available today.
There are liquids of such DOT-3, 4 and 5 standards on the market today. Each of them has its own chemical composition and slightly different properties. Consider each in more detail:
- DOT-3. Has a boiling point of 205 degrees Celsius. It is based on glycol. Aggressive to rubber gaskets and products, it can corrode paintwork. Therefore, do not let drops of pillbox 3 fall on the car body, and if it does, wash it off immediately. It is hygroscopic (absorbs moisture from the air);
- DOT-4. Its boiling point is 230 degrees. The basis is again glycol, so the threat of damage remains for paint and varnish surfaces. Although, rubber pillbox 4 does not corrode, unlike the previous standard, and is less hygroscopic;
- DOT-5.1. Boils at 275 degrees. High hygroscopicity. Does not harm rubber products, but is dangerous for paintwork;
- DOT-5. The most advanced liquid, silicone based. Boils at 250 degrees, is safe for rubber and paint. Virtually no water absorption;
In addition, there are categories within the standards that have improved characteristics, but are not provided for by the classification:
- DOT-4 can be found in the form of DOT-4.5 or DOT-4 Super;
- There are also DOT-4 / ABS and DOT-5 / ABS, for cars with ABS systems;
- DOT-3 and 4 are yellow (ranges from light to almost brown);
- DOT-5. pink or red;
For Camry v50 and other branded Toyota cars, the Dot-4 standard, branded production is recommended.
Any other car, you need to use the fluid recommended by the manufacturer and written in the manual for the car. The volume of the RAV4 (Toyota rav4) brake system is about a liter. For cars with a smaller volume, a liter is still purchased, it will come in handy for refilling.
What type of brake fluid for Toyota cars
Hello again everyone, today I will tell you how Toyota brake fluid changes, and which one is better to choose for replacement. The brake fluid of any car has to be changed, and the Toyota Corolla is no exception. This is due to its hygroscopicity, the ability to absorb water vapor and gradually become saturated with water. In this case, the properties are greatly reduced, and the brakes can malfunction, and this is life-threatening. Therefore, replacement in Camry v40 and other TZ models is inevitable.
How the brakes work
All modern cars are equipped with hydraulic braking, and so is the toyota RAV4. I’ll tell you in a simplified way how it works:
- When the brake pedal is depressed, there is pressure on the piston (through the rod) inside the main brake cylinder.
- By the movement of the piston, fluid is pumped through the brake system, through the tubes to the working cylinders.
- The working cylinders cause the pads to be pressed against the brake discs (or drums, if the brakes are drum).
- Friction occurs, which reduces wheel speed and the machine stops.
The operation of hydraulic systems is based on the property of a liquid to retain volume and not compress, under pressure.
Theoretically, any liquid is suitable for braking the Camry grace. water, oil, and others. In reality, the TJ must have a number of properties, otherwise the brakes will malfunction. And this, you see, is unacceptable.
I filled my mountain bike brakes with baby oil for a year and here are the results!
From friction slowing down the car, the braking elements (pads, drums, discs) become very hot, which causes heating and fluids in the hydraulic system. The liquid boils, bubbles appear, which are easily compressed. When the pedal is pressed, the force is not transferred to the full, it is lost on the compression of the bubbles, and braking is slower or does not occur at all.
Therefore, as a brake for Camry v40, a fluid with a high boiling point is needed. In addition, the pistons of the system need lubrication, which means that it must have lubricating properties. The use of simple oil for Prado 150 is impossible, because it thickens in cold weather. The fluid in the brake system must not freeze or thicken during the cold season. Otherwise, you will find yourself without brakes in winter, in a season when working brakes are needed more than ever.
It turns out that modern TJs are a mixture of several substances of different properties with the addition of additives. That allows it to serve in any conditions (at different temperatures), while maintaining the desired properties.
Timely replacement of brake fluid in Avensis, a guarantee of smooth operation of the brakes.
How often is it done
Replacing the TJ in the car is required periodically, even if everything works well. This is due to the hygroscopicity of liquids of this type. In Corolla 14, it is necessary to change the TJ, even if you have not driven it. Gradually gaining water from the air, it loses its properties, the boiling point decreases. Having lost half of its properties, it is no longer suitable for use, because the brakes will not work at full strength.
Changing the fluid in Toyota Venza, and other cars of this family is recommended every 40-50 thousand kilometers traveled. Or every 2-3 years, if during this time you have not driven so many kilometers.
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Malfunctions and bleeding of the brake system VAZ 2107
VAZ 2107. the car is far from perfect, it cannot boast of the reliability of its systems. Including braking mechanisms, on which the safety of driving a car depends. Sometimes situations arise when the system is ineffective or there is a brake fluid leak. in such cases, urgent repair is required. The work can be done independently, for which you will need to prepare the necessary tool and read the instructions.
Repair of the main and working brake cylinders
The main brake cylinder is the main component of the hydraulic brake actuator. When the driver presses the brake pedal, the GTZ creates high pressure in the system, which drives the pistons of the working braking mechanisms. The latter press the brake pads against the discs and drums.
Repair or replacement of the master cylinder is carried out when the unit does not cope with its functions. To carry out repair work, the mechanism must be dismantled from the car and disassembled. This will require a set of keys and screwdrivers, as well as a repair kit for the GTZ and brake fluid. To dismantle the cylinder, you need to remove the hoses and pipes connected to it, and then unscrew the fasteners to the vacuum amplifier. For disassembly, carefully unscrew the plug nut so that the parts located inside do not scatter to the sides. After disassembly, the worn out elements are replaced with parts from the repair kit. Assemble in reverse order.
The working brake cylinders are repaired in the same way. If the cuffs or piston are in poor condition, then the parts need to be replaced. It is best to completely change the cylinder, which will be much more reliable.
Malfunctions of the brake system VAZ 2107
The safety of driving a VAZ 2107, like any other car, directly depends on the effectiveness of the braking system. If there are problems with it or repairs are carried out, bleeding of the brakes is required. In order for the system to always be in good working order, you need to know how malfunctions manifest themselves and what causes them.
What kind of brake fluid to fill in the VAZ 2107 and how much
The VAZ 2107 brake hydraulic drive system uses DOT-4 brake fluid. Its volume is 0.382 liters. The liquid is topped up or changed not only in case of repair, but also when the color changes or moisture gets into it. As a rule, on classic Zhiguli, a complete fluid change is performed every 3 years. The essence of the procedure is reduced to pumping liquid through the system.
Liquid is leaving the tank
One of the maintenance points for the VAZ 2107 is to monitor the level of brake fluid in the expansion tank. If it was found that it decreased, it is imperative to find out the reason that led to this. It is not worth tightening, since breakdowns are possible in the braking system, which can lead to failure at the moment of emergency pressing of the brake pedal. Consider the most likely reasons why fluid can leave the tank:
- Leakage through the brake cylinder. It is necessary to inspect the working mechanisms of braking for smudges. To do this, you need to get under the car, for example, on an overpass, and pay attention to the inner side of the wheels. If traces of liquid are found, it is necessary to repair or replace the faulty cylinder.
- Depressurization of the braking system as a result of wear of the cuffs of the main brake cylinder. It is not difficult to determine this kind of malfunction. To do this, check the GTZ for smudges. If traces of brake fluid were found, it will be necessary to repair or replace the product with a new one.
- When inspecting the elements of the braking system in order to detect fluid leaks, do not lose sight of the rubber hoses. Over the years, the rubber dries up and cracks form on the surface of the products, through which liquid seeps. If traces of leakage were found in the places where hoses adjoin cylinders or pipes, as well as on the surface of rubber elements, they must be replaced.
How to fix a Shimano hydraulic brake without bleeding it.
As the brake pads wear out, the piston stroke in the working brake assembly increases, which can also lead to a decrease in the fluid level in the reservoir.
In any case, it is necessary to control the level and prevent it from falling below the minimum mark, timely topping up the liquid.
Liqui Moly Bremsflussigkeit DOT-4
This is another sales leader in the Russian market. The price tag here is not as big as that of Castrol. A half-liter can will cost you 300 rubles, which is quite a bit. The threshold for boiling fresh liquid is 250, and about 165 degrees Celsius. Viscosity. 1800 mm 2 / s. In general, “Liquid Moli” fits into the framework of the DOT-4 standard, but nothing more. However, it is worth giving preference to “Castrol”, but if funds are not enough, then “Liquid Moli” is perfect.
It is worth noting that the manufacturer has focused on protecting the brake system from corrosion. They did it wonderfully well, as evidenced by the experimental data. There are no signs of rust throughout the entire service life. The company also paid great attention to the lubricating properties of the liquid. It can be recommended for use in the central part of Russia and to the south. “Liquid Moli” can be mixed with DOT-3 and DOT-4, not recommended with DOT-5.
Brake fluid DOT-5.1 and its features
The main difference is the higher boiling point. The chemical composition is similar to DOT-4. It is often used in racing cars and motor vehicles, where high speed develops and prolonged intensive braking is characteristic.
It is worth remembering the rules for mixing brake fluids. If DOT-3 is filled in, then DOT-4 and DOT 5.1 can be topped up. And if in the DOT-5.1 system, then only the analog is added. Failure to comply with this rule can lead to jamming of the system and failure of the brake mechanism with all the ensuing consequences. It turns out that the compatibility of the DOT-4 brake fluid is reduced to adding more advanced DOT-5.1. It is not always convenient, although it is correct from a technical point of view.
How to make the right choice?
Everything here is extremely simple and straightforward. Much depends on your riding style. If you prefer an aggressive demeanor on the road, then it is better to choose “Castrol”, which, although it is positioned as DOT-4, but its characteristics speak of a higher class.
For a quieter and measured ride, any of the domestic manufacturers is perfect. True, it is important here to pay attention to the viscosity of the liquid at subzero temperatures. For the northern regions, it is advisable to give preference to more fluid fluids.
Another important point before deciding which brake fluid to fill is to save the brake system. In this case, it is best to choose “Liquid Moli”. It is from this manufacturer that the brake fluid shows the best results. It does not lead to corrosion, but, on the contrary, protects the system from it, which is very good.
RosDOT-4 at a glance
As you can see, the best DOT-4 brake fluid is produced by Castrol. Despite the high cost, it is very, very good.
Regular system maintenance
It is very important to lubricate the calipers in time, change the anthers and guides. This also applies to discs with pads, which wear out during operation. The braking system on a modern car is quite complex. Consists of an ASB block, highways, etc. All elements must be monitored. Only then can you be sure that the brakes will not fail during extreme braking.
It is recommended to use graphite and copper lubricants to service the brake system. They are needed so that when replacing a part, it is easier to replace it. Indeed, due to high temperatures, the metal very often sticks, copper spray does not allow this.
As for the brake fluid, it is still recommended to use the one prescribed by the manufacturer. Usually, the manufacturer simply indicates the marking, for example, DOT-3 or DOT-4, without any specification. In this case, you are guided by yourself based on your preferences. The choice should be influenced by factors such as:
- driving style;
- the state of the braking system;
- corrosion protection;
- product cost.
Brake fluid “Lukoil DOT-4
The boiling point of this liquid is 170 degrees (humidified) and 240 (dry), which is quite suitable for the standard, even with a small margin. Lukoil DOT-4 occupies a fairly high position in the rating due to its stability and high quality. In addition, the low cost of the product makes it more affordable for the consumer.
There are practically no fakes of “Lukoil DOT-4” on the market, since the products are well protected and have a low price. In general, this is a worthy contender for the title of the winner, however, we will consider a few more options.
Castrol React DOT4 Low Temp
A half-liter can from this manufacturer costs about 450 rubles. Not the cheapest option, but one of the best. The boiling point in a wet state is 175 degrees, and in a dry state. 265 degrees Celsius. According to the regulations, replacement is made every two years of operation.
It should be noted that DOT-4 Low Temp brake fluid is excellent for use at critically low temperatures. The manufacturer deliberately lowered the viscosity of the liquid to 650 mm 2 / s. Looking at the test results and characteristics of this liquid, we can say that this is a full-fledged DOT-5.1. Nevertheless, DOT-4 liquid is more in demand on the market, therefore it is more expedient to sell it. The composition of the brake fluid DOT-4 from Castrol differs from its analogues in the package of additives that increase the boiling point.
What is very important
Boiling point is one of the most important indicators of high-quality brake fluid. The fact is that due to the heat given off by the pads and the disc into the system, ordinary liquid will boil. This leads to the formation of bubbles in the system and the formation of an air lock or complete failure. On the road, such a situation is likely to lead to an accident.
That is why brake fluid manufacturers try to maximize the boiling point. After all, this gives more reliability. We all know that the viscosity characteristics of a liquid change with its temperature. This should not happen in brake fluid. Let’s take a closer look at what DOT-4 brake fluid is, which is better, and other important points.