How to install hydraulic brakes on a mtb | How to build a MTB | Bike Build
Adjusting the rim brakes
You can learn how to set up rim brakes on a bicycle by carefully studying the instructions for their design. In addition, information on this topic can be found in abundance on cycling websites. Usually, the process of adjusting the rim brakes does not cause absolutely no problems even for a novice bike rider. The fact is that the main operation for servicing the brakes of such a system is to replace the brake pads, so all the subtleties here will consist in the correct operation of the mechanisms holding them.
It is worth noting that, in general, most modern bicycles use a V-Brake type of brake pad mount. It is characterized by the presence of separate levers in their design, made in the form of the letter V. They are connected by a cable held by a jacket. It is about the maintenance of this type of brake system that we will tell.
In order to carry out maintenance of the rim brake, you must:
- Open the brake, and using force remove the cable jacket from the mount.
- Unscrew the screw securing it to the frame.
- Remove the brake mechanism.
- To work with pads, unscrew the pads fixing screw.
At the same time, be careful not to forget the correct sequence for installing the washers. The fact is that they are mounted in pairs. concave and convex. The correctness of the adjustment of the entire brake system depends on how correctly they are installed.
Finished brake cartridges must match the brakes of the bike exactly
Since the most common operation is brake pad replacement, let’s take a look at it. To do this, you will need to perform all the operations listed above and pry on the old block to remove it. A new one is installed in the vacant place. When performing this work, you must be careful, since you will have to adjust the brake shoe in place.
Attention! In the event that you install ready-made brake cartridges, you will have to carefully ensure that such cartridges exactly fit these brakes.
In addition to replacing the brake pads, they are adjusted on the spot, and the level of the cable tension is also controlled. For this, the screw located on the brake lever is tightened to the desired state. As a result of this clockwise rotation, the brake pads move away from each other.
In addition, the tilt of the brake shoe is also adjusted by loosening the fixing screw. If you have recently purchased a bicycle and it is difficult for you to follow the procedures described on your own, then in order to learn how to adjust the brakes on a bicycle, you should watch a video on this topic.
If new pads are installed on the bike, then the main thing is to put on the spacers and washers in the correct sequence.
How to set up rim brakes on a bike
The braking system is one of the most important technical components of a bicycle. The safety of both the cyclist and other road users directly depends on its condition. Good brakes are essential in any situation, from riding in parks to tough cycling.
In the modern classical sense, a bicycle brake is a pressure mechanism that acts on the wheel rim. In fact, there are several types of brakes, however v-brake (rim) is the most common option on bicycles of various classes.
Adjusting the rim brakes
Mountain bikes use a v-brake braking system. by its example, we will consider the principles of tuning, as it is also available on other bicycles with rim brakes. The difference can only consist in a different arrangement of bolts and screws that will need to be tightened / tightened.
Note: it is important to observe three main rules:
- the pads should be parallel to the rim;
- the gap between the rim and the block should not be more or less than 1 mm;
- the pads should be symmetrical with respect to each other.
How to achieve these guidelines when adjusting rim brakes on a bicycle:
- You need to find a hex nut. it fixes the pads. To loosen it and set the brake pads in the desired position, you need to press the brake lever and watch how the shoe touches the rim. By releasing the brake lever, the shoe can be set to the desired position. it moves up, down and at an angle.
- The distance between the block and the rim of the wheel should not be more than 1 mm, although in some models of bicycles there are also 2-3 mm. exact information about a specific vehicle can be obtained either from the instructions for it, or on the Internet for technical characteristics. It should be for Honor that the wheel should be braked even with the smallest pressure on the brake lever. That is, if the wheel stops only when the brake lever is fully pressed “all the way”, then this is incorrect.
After carrying out all the specified work, it is imperative to check the operation of the brake system. First, this is done at idle speed. lift the front wheel up, spin it up and press the handle sharply, then do the same with the rear wheel. The next step is to check the operation of the brake system “in action”. get on the bike and ride 3-5 meters, braking sharply. If the bike stops even when the brake lever is pressed slightly, then the system has been serviced correctly.
Varieties of rim brakes
Rim brakes are divided into several types:
- V-brake (vector mechanical);
- hydraulically driven.
Caliper brakes. previously popular modifications, are now rare on the market. They are a classic model of rim brakes with attachment to the fork or stays of the bicycle frame. Design features and operating principle:
- Consist of a handle, a drive cable, two movable bows and brake pads.
- The handle is attached to the handlebars of the bicycle, a cable is pulled from it and fixed on the clamping side of the arches. The body itself is attached strictly above the wheel, pads are screwed to the lower mounts of the arcs.
- Through the cable, the force is directly transmitted to the clamping part of the arcs, due to which they are compressed, and the pads are in contact with the rim.
- Responsible for unclamping is an elastic metal insert or spring built between the levers.
The levers have a single axis of rotation and move towards each other like pliers pincers. Hence the name. tick-borne. Advantages. ease of installation, simple setup. Cons. weak braking force, low modulation, high abrasion of the pads, require frequent debugging. Fits on road racing bikes and optionally as a front rim brake on road models.
Cantilevers belong to the second type of disappearing brakes. The principle of their work is to extend the levers under the action of a taut leash. The principle of operation of the cantilever brake:
- Through the main cable, the force is transmitted to the jumper.
- The cable pulls the jumper up, the leash attached to it is pulled.
- The leash connects both levers, which are rigidly attached to the frame.
- Due to the convergence of the levers, the pads approach the rim.
The cantilevers are dirt resistant, will not bump the tire and are easy to install. Significant disadvantages include:
- decrease in braking force as the leash is pulled;
- you need to create a high effort to stop the bike completely;
- difficulty of adjustment.
In justification of the latter, it should be noted that the position of the pads can be adjusted within wide limits.
V-brake is a common type of rim brake on high-speed bicycles. Compared to cantilevers, it has a higher precision and longer shoe longevity. They are also easy to remove and repair yourself.
The vectors are partially similar in design to cantilevers: the front brake levers are bolted to the fork, the rear brake levers are attached to the upper stays. The legs are connected to each other by a pulling cable. The drive cable is brought to one side, but due to the straight shape of the “tie” forces are equally transmitted to both levers.
Hydraulic bicycle rim brakes are a more advanced mechanical design. The drive system consists of a control cylinder, a hydraulic line and power cylinders. The forces from the handle are transmitted to the master cylinder, which, through the oil, acts on the power cylinders. Those, in turn, move the pads towards each other.
Advantages. high compression force and efficiency, excellent modulation. Disadvantages. deterioration of work with a blockage of the hydraulic line, complex repairs. Used a similar type of brakes for freeride and trial.
Rim-type brakes have low brake pad travel, which means they wear less during operation. A significant disadvantage of this approach is the inability to be used on wheels, even with minor rim curvatures. Sensitive brakes will rub against the wheel on the fly, causing reduced speed and increased pad wear.
Braking system characteristics
The following terms are used to qualitatively describe the operation of rim brakes:
- impact force;
- wear resistance;
- service requirements;
- comparative features.
The force of impact, or braking, is a parameter that shows how much the brake can clamp the rim so that the bike cannot be moved. Maximum effort is required only to completely stop and lock in place. On the road, the effort is not fully used to adjust the speed. The range of action on the wheel rim by pressing the knob is called modulation, or accuracy, of the brakes.
An active cyclist uses his vehicle not only in dry and cloudless weather. Rain, mud, sand. everyone who rolls out their bike on long trips will have to face this. The effectiveness of brakes allows you to describe their behavior in a wide variety of conditions.
Durability is a measure of durability, taking into account the prescriptions for the use of the bicycle as a whole. Timely maintenance can increase the service life of the braking system. Service Requirements provide guidance on how to properly install and adjust the machine, how often to do this, and guidance on how to replace parts.
Types of bicycle brakes
In order to know how to properly set up the brakes on a bicycle, you need to be able to understand their design. Today, modern bicycles are equipped with the following types of brakes: rim, drum and disc. over, each type of brake system is subdivided into subspecies.
- V-brake type.
Drum brakes do not have subspecies, but disc brakes have the following varieties:
Rim brakes are those braking systems in which the wheels of a bicycle are braked by clamping the wheel rim. As a result, the rotation speed is reduced until the vehicle comes to a complete stop. Rim braking systems are among the most common due to their simplicity and low cost. They are used on almost all types of bikes.
Bicycle Hydraulic Brake Device
Drum brakes, or roller brakes, are very similar in principle to those used on cars. Here, the braking elements of the structure are placed inside the wheels, and they stop their movement by pressing against the rotating part of the wheel. Since brakes of this type have a large mass and are rarely repairable in field conditions, do not have sufficient strength, they are usually used on walking bikes.
As for the disc brakes, they are the most common today and they are installed both on cars for beginners and on professional bikes. Their device consists of a disc securely attached to the wheel hub, as well as to the frame or caliper fork, hydraulic tube or cable. The task of the latter is to transfer the force created by the cyclist’s brush when braking to the caliper. This braking system does not need constant tuning, is not afraid of precipitation and cold weather, and has a long period of operation.
Bicycle disc brake device
To know how to set the brakes on a bicycle correctly, you will need to carefully study the design of all types of braking systems. At the same time, some types of bicycles are equipped with rather complex braking systems, and therefore the bicycle owner, in order to have an idea, for example, how to adjust the hydraulic brakes on a bicycle, will need to carefully study the instructions for it. It is worth reading the materials on this topic located on specialized sites dedicated to cycling.
Adjust the position of the brake lever and the tension of the cable
To bring the brake lever closer to the steering wheel (for example, so that you do not have to reach for it with your fingers), tighten the bolt on the brake lever.
How To Convert To Hydraulic Disc Brakes From Mechanical Disc Brakes On Mountain Bike
In this case, keep in mind that you should not bring the handle too close to the steering wheel. It should not touch the grip when fully clamped.
When the position of the brake lever is set, it remains to adjust the tension of the cable. The task is to bring the pads as close to the rim as possible, leaving a distance of 2-3 millimeters between the pad and the rim.
To do this, you can tighten the cable in two ways:
For a rough adjustment, if the cable is very weakly tensioned, and the pads are far from the rim: loosen the bolt fixing the cable in the brake lever, tighten the cable, tighten the bolt.
While loosening the bolt, hold the lever and the cable so that the cable does not “run away” and you do not have to re-thread it into the seat.
for fine tuning, we use the adjusting screw at the point where the shirt comes out with a cable from the brake lever.
To make the screw spin freely, loosen the lock nut by unscrewing it counterclockwise. Turning the screw clockwise, we loosen the cable tension (the pads move away from the rim), unscrewing it counterclockwise, we increase the tension (the pads are closer to the rim). When the pads are in the right position, tighten the lock nut.
That’s all! Checking how everything works. If necessary, readjust the springs of the levers (item 3).
How to install and adjust the V-brake yourself
- Attach the levers to the bike frame.
- Insert the drive cable into the brake lever.
- Install the handle on the steering wheel, insert the cable into the grooves on the frame (if any).
- Connect the cable with the levers and put the spring.
After installation, you will definitely need to adjust the brakes.
The accuracy of the mechanism depends largely on its settings. So, even an expensive system will not work well without proper adjustment, and conversely, a mid-range V-brake can outperform a disc brake in terms of efficiency. What needs to be done to adjust the brakes?
Adjust the cable tension. After adjusting, the brake should instantly respond to the squeeze of the handle and rebound when it is released. If the pads do not move away from the rims, this indicates insufficient tension. On the overtightened cable, the handle will be hard to press, and the sheath may burst.
The tension is adjusted with a bolt on the side of the levers. The setup looks like this:
- Reset Springs.
- Loosen the cable fixing bolt.
- Adjust the tension so that in the fully clamped position, the distance from the handle to the handlebar corresponds to the thickness of the finger.
If damage is noticed on the cable sheath, it is recommended to immediately install a new set.
Clearance adjustment. The optimal distance is 2. 3 mm from the edge of the pad to the rim. Determination of brake pad wear: cannot be used when the diverter grooves are completely erased (the whole surface is flat).
If your bike has cartridge pads, you only need to change the pads. Their position is set with a cotter pin; before removing the old surface, it is removed from the body. Similarly, in the reverse order, insert a new pad and fix it with a cotter pin.
Adjustment of the position and displacement of the shoe housings are carried out by means of a bolt and washers. For accurate fixation, you need to squeeze the brake and set the position of the pads strictly on the surface of the rim.
The last step will be to test the operation of the system in practice, that is, in real driving conditions. As a rule, the V-brake setting is obtained immediately. However, if braking is delayed or the handle does not fully return to its original position, the brakes must be readjusted.