How to set up disc brakes on a bicycle?
How to set up disc brakes on a bicycle is something that many novice riders do not know. Technologically, such parts are more advanced than the V-brake, thanks to which they perform their functions better. However, you shouldn’t buy low-quality cheap parts.
System check before the procedure
Make sure the adapter is securely attached to the bike frame before adjusting. Examine the rotor. Normally, the part is smooth, tightly screwed to the sleeve. Check the element for deformation. To do this, lay it on a flat surface. A loose fit indicates a need for alignment. Wheels must be screwed tight.
If a mechanical braking system is installed, it will be necessary to check the condition of the jackets and cables. Replace loose cables with torn fibers. Cracks or tears on the shirt are also a reason for replacement.
Hydraulic brakes require a hydraulic line check. If leaks or damage are found, it is recommended to replace the element. Should be changed even with minor breakdowns.
Inspect every element of the system. If any is found to be in poor condition, damaged, replace it. Carry out these inspections on a regular basis in order to replace worn parts in a timely manner. If you ignore this procedure, driving becomes dangerous.
Oil and dirt gradually build up on the rotor and brake pads. Please remove them before configuring. It is recommended that you wipe the parts regularly as dirt can cause breakage. The elements should be wiped with sandpaper. Don’t rub aggressively. It is enough to get rid of the thin layer. When the procedure is completed, avoid touching the treated parts with your fingers or greasy compounds.
Determine if the rear wheel is installed correctly. It is normally located at right angles to the surface, does not warp. Place the vehicle on the wheels, slightly loosen the eccentric, push down on the saddle and tighten the eccentric.
The adjustment is carried out if there is friction between the disc and the pad. A procedure will also be required in case of deterioration in the work of the part.
The brake lever is squeezed to the limit. Unscrew the locknut of the machine, then turn the regulator out. It may be necessary to loosen the cable. In cases where the brakes are installed crookedly, it is necessary to loosen the adjusting screws. Unscrew the screws securing the braking device. When the caliper becomes movable, squeeze the handle to the limit and lock in a given position. Center the machine on the disc. Then you need to tighten the screws securing the machine. Repeat the procedure periodically to avoid movement of parts.
After completing the process, lower the handle. To avoid permanent shifts, follow the recommendations given in the operating instructions.
Adjusting bike brakes
Each option has its own adjustment features. If in doubt about your abilities, contact the service center to specialists.
Adjustment of disc brakes will be required when unpleasant sounds, squeaks, grinding, or when there is strong wheel resistance when driving.
Remove the caliper bolts. After that, squeeze the handle as much as possible to press the pads against the wheel. Consider the position of the valves. Parts must be at the same distance from the rotor. If the gaps are uneven, press down 1 element, then work with the handle 10 times. In this case, the unevenness should disappear. Tighten all screws. When the caliper is locked, lower the handle. In this case, the block should not press against the rim. The clearance to the stationary part is normally about 1 mm.
The adjustment is completed by setting the handle to the required position. To fix the part, a special hexagon is used.
When the work is finished, check how the brakes work. It is not necessary to go far. it is better to check in front of the house or service center. If the parts function well, the job is done. If problems are found, re-inspect the bike, try troubleshooting.
Setting up the hydraulic disc brake
The reason for tuning, as always, is resistance to wheel movement, as well as extraneous sounds, for example, creaking and rustling. Do not forget about a simple check: a suspended and spun wheel quickly stops if the pads touch the brake disc.
- We loosen the bolts on the caliper so that it is movable, then squeeze the brake handle so that the pads are pressed against the rotor
- Now it is worth checking the position of the valves on the pads so that they stand symmetrically and equally from the rotor.
- Now you need, without releasing the handle, tighten all the screws on the caliper.
- We release the handle, check the operation of the mechanism. In the best case, the pads from the disc should be at the thickness of the hair, but not touching it.
- If the pads are still located at different distances, but at the same time the rotor is ideally placed in the machine, then you can do this: press the disc against the pad that protrudes more strongly, and work sharply with the brake handle about 10 times. The unevenness of the valve aligns the pads, and the malfunction is corrected. It is better to do this together: the assistant presses the disc to the block with both hands, and the other squeezes the handle.
- At the end of the setting, we set the brake lever correctly using the adjusting hexagon. The main thing to remember here is that moving the handle closer to you simultaneously brings the pads closer to the rotor and vice versa.
Let’s say that whatever brakes you choose, you should always be confident in them. And only when all your orders the bike will execute flawlessly, you will get real pleasure.
Adjusting the brake lever travel
This adjustment allows you to adjust the position of the handle when the brake engages. There are no specific recommendations on this matter. Someone is more comfortable for the bike to brake at the slightest push on the handle, someone more like the presence of a small idle and a dead grip in the middle of the lever path.
This adjustment is carried out using a screw located in the brake lever housing. The final adjustment of the severity of the brake engagement is made by the cable tension thumbscrew.
Attention! After completing all adjustments, check that the pads are equidistant from the rotor. It is possible that the fixed friction lining will have to be readjusted.
How to set up and adjust disc brakes on a bicycle
New bicycles are often equipped with rim brakes, or V-brakes, and Soviet bicycles have always been fitted with the only existing caliper brakes. Currently, this is due to the desire to reduce the cost of the design: it is no secret that many cyclists dream of changing the brakes to disc brakes as soon as possible. Often, even when choosing a bike, the costs for changing the brake system are included in the amount.
Since the principle of operation of disc brakes is different, it is impossible to adjust them according to the same scheme. Brake disc mechanisms are:
- mechanical. In this case, the braking energy is transmitted mechanically, using a cable;
- hydraulic brakes, which have a specially laid hydraulic line, and the braking energy is transmitted by the pressure of the liquid column.
Advantages and disadvantages of mechanical brakes
Mechanical brakes are cheaper, cables and casings (jackets), in which they are located, are quite reliable, more accessible than hydraulic lines. It is also important that the repair of a mechanical brake in the case of a bent disc is easy to carry out on your own.
How to adjust disc mechanical brakes on a mountain bike
Mechanics are gradually becoming history. Now it can still be seen in the budget line of Russian Stels, Forward and Stern. Considering the price, there is no need to talk about the belonging of brake system parts to such global brands as Shimano and Sram. Usually this is some kind of noname kit that has a minimum of settings.
Another nail in the list of disadvantages of mechanical disc brakes is that they need to be adjusted more often. This is because one of the pads is motionless. As it is erased, the distance between it and the disc automatically increases. Meanwhile, fluctuations in the values of this gap should be insignificant, otherwise the friction linings will wear unevenly, the quality of deceleration suffers.
Working with a caliper
Adjusting mechanical disc brakes on a mountain bike is a two-step process: adjusting the caliper and adjusting the brake lever. To adjust the caliper means to align the pads symmetrically with respect to the disc, while the gaps should be minimal.
When adjusting the caliper, it is important to follow the sequence of actions:
- Center the clipper. Loosen the bolts securing the caliper to the adapter and, moving the caliper, find such a position in which the pads will be equidistant from the disc and completely parallel to it. After centering the machine, pull it to the adapter, observing the rule of uniform tightening: turn one bolt ¼ turn, then the other also ¼, and repeat the described procedure again with the first and second fasteners.
- Align the clearance between the fixed pad and the disc. Any grade of mechanical disc brake caliper has a bolt or adjusting wheel to move the fixed pad closer / away from the disc. Here the task is to use this adjustment in order to bring the block as close to the rotor as possible, while maintaining the clearance. The easiest way to do this is to move the friction pad close to the disc, but so that it does not bend it, and loosen the bolt a little to get a small gap.
- Adjust the clearance between the rolling block and the rotor. On serious kits, a special adjustment is provided for this. a bolt that moves the block regardless of the tension of the cable. On cheap bikes, this setting is combined with the cable tension. The task is to set the same gap as between the fixed friction lining and the disc.
Advice. Adjust the clearance so that the friction linings grip the disc tightly in the middle of the brake lever travel. To do this, you will need to adjust the tension of the cable using a wing and the position of the fixed shoe (in order to maintain symmetry about the rotor).
For your information. Caliper centering can be skipped if this operation was performed earlier and the wheel was not removed.
Adjusting the brakes on a bicycle
Adjusting the brakes on a bicycle should be carried out regularly. such maintenance will guarantee the safe operation of the vehicle. There are two main types of brakes on modern bicycles. rim and disc brakes, but disc brakes can be mechanical or hydraulic. The process of their maintenance will depend on what type of brake system is installed on a particular bike.
How to set up mechanical disc brakes on a bicycle
How to set up the brakes on a bike?
Any vehicle, be it a car, motorcycle or bicycle, is safe and suitable for use only in one case. with a working braking system. Correctly configured and well-functioning brakes ensure that you can control the bike responsively and efficiently, and your safety also depends on it. And if it seems to you that ordinary trips through the park or city streets are not as dangerous as they are described, then this is not at all the case. danger lies in wait for the rider at every corner, or even on straight sections of the road.
This is why, before each new season, cyclists test the two main systems on their bike. the transmission and the brakes. As for the brakes, they really need to be tuned not so often, as they write about it in the manuals and advise in the workshops. one full-fledged setting is enough for about 3 months. As problems arise, you will “tune” the brakes. With such consistent maintenance, you are unlikely to admit a major problem, and minor malfunctions should not scare the experienced cyclist.
So, let’s start by describing situations in which brake adjustment is really necessary.
- vibrake (from the English V-Brake);
In most cases, vibration racks are installed on bicycles, as they are simple and reliable. In addition, today there are vibrays of any price category. from frankly cheap models, which are better to bypass, to frankly expensive ones, also dubious. The best option is proven rim brakes at an average price from the world’s leading companies: such systems have managed to prove their reliability and “interchangeability”. all elements are maintainable and, more importantly, they can be replaced with new or special “working”.
So, in order to fix the vibrating racks, you first need to remove them from the steering wheel and wheels for diagnostics. When working with the brakes, you do not need to remove the wheels from the bike, otherwise you will not be able to properly fix and adjust the pads.
- We take out the cable from the holder, for this we carefully take it by the shirt, and take it out of the groove with “swinging” movements.
- After opening, you need to remove the fixing screws with a screwdriver, and disconnect the brakes from the steering wheel.
- The next step is to remove the retaining screws from the pads attachment. It is important here, ideally, to remember the order of their location. each screw is regulating, which means it has its place. It is better to spread a small towel and fold the brake on it in a disassembled state. so none of the elements will be lost for sure, and you will not confuse the order of fixing the washers.
So, the brakes are off, now you need to carefully remove them from the bike, without damaging the cables, and inspect. First of all, look for chips or serious damage, then see if the brake looks good. if the mounts are dirty and the cable is rusted, you will need to put them in order.
Then let’s move on to updating the pads. Remove them, and using a paper clip or a thin awl, determine the size of the “hardened” layer, if it is too large, the pads will have to be changed. If the layer is small, then you will need to be careful. really careful, keep your fingers from the insidious rubber! remove it with a sharp clerical knife. After that, all that remains is to clean up the cut area with fine sandpaper so that the rubber on the pads is smooth and suitable for work.
If you decide to replace the pads completely, then it’s even easier: we remove the old one, put a new one, cutting off the excess if necessary. Cartridge pads are generally installed in 5 minutes. the procedure is as simple and unpretentious as possible, even a beginner can handle.
Then, after putting on new pads or updating them, you need to put the brakes back in place, and start adjusting the degree of tension of the cables, thus adjusting the distance from the pad to the rim. To begin with, turn the screw on the brake clockwise and counterclockwise. If the adjustment with the adjusting screw is not enough, then you need to unscrew the cable clamps and tighten them or, on the contrary, loosen them. you will see for yourself what needs to be done, in fact it is very simple. After tightening the cables, fix them again. When finalizing the shoe mount, follow three principles:
- the pads are in the plane of the rim, do not go beyond it;
- the pads are located clearly parallel to the rim both with the brake lever depressed and with the straightened one;
- the pads are pressed against the rim along the rotation vector.
That’s it, this completes the rim brake adjustment. Check how they work: with the bike upside down and spinning each wheel in turn, press the brake levers.
When to adjust the brakes?
- After a break in skating. The longer the bike has stood / sagged “idle”, the less its components begin to meet the real conditions of driving loads. The worst option is to store the bike in a cold garage, basement, or simply unheated room. Cold negatively affects all bike systems, gradually rendering them unusable.
- After a long drive. If you have, say, participated in a professional or amateur ride, or have just returned from a long bike trip to another city, then you cannot do without “adjusting” the brakes. The explanation is simple: the system has had a high load for a long time, which means that it needs diagnostics and maintenance in any case.
- When the brakes started to work worse. Previously, you slowed down by lightly pressing the lever, but now you need to “squeeze” it into the handle until it stops; before the handle returned to its place smoothly and easily, but now it “hangs” and slowly creeps to its initial position. All this suggests that something is wrong with the braking system: in the examples listed, the whole trouble lies in the loosened cables, but in real conditions, the problems often do not end there.
- When “breakage sounds” appeared. Here you are driving, and suddenly you notice that some other sound has become a companion of the rattling and rustling of tires. crunching, knocking, humming, buzzing, whistling or whatever. This sound did not exist before, and now it appeared. clearly not for good. If you think something like this, then it’s for a reason. “additional” sounds really should not appear on their own. Their presence indicates a breakdown that has occurred.
- When damage is visible to the naked eye. For example, the braking handle will burst, or the transmission mechanism will break, maybe the cable will split or break. there are countless options.
In all these cases, it is imperative to diagnose and adjust the brakes. But it is not necessary to do this only when the breakdown has already happened: if you think that the time has come to “twist and tighten” a little, then it is so. A bicycle, like any vehicle, requires maintenance.
There are three main types of bicycle brakes.
- Foot. It is unlikely that brakes of this type are installed on your bike. they are installed either on the simplest walking models, or on special lightweight city ones, for example, cruisers. Foot brakes are well known to every rider on Soviet bicycles. almost all of them were equipped with just such a brake system. The brakes themselves are very simple, reliable, lightweight, efficient and do not require any adjustment at all. it would seem that they are just perfect. Unfortunately, standard foot brakes do not meet the demands of high-speed bikes.
- Rim. Very common on all types of bicycles. they are efficient, simple and weigh less than discs. On the downside, in the long run, the rim will suffer irreparable damage from the brake pads. Rim brakes are installed, as already mentioned, on any bikes: city, road, mountain, hybrids, road and even stunt bikes.
- Disk. The most progressive category of brakes: they are distinguished by the best braking performance, independent of the condition of the bicycle in general and the wheels in particular, as well as high reliability. Disc brakes allow you to customize the bike as much as possible “for yourself” so that the bike makes the appropriate “response” to your every action, and braking efficiency comes to the fore here. Good bicycles are equipped with mechanical disc brakes. they are used on mountain models, both hardtails and full suspension, as well as on bicycles designed for extreme riding on rocky and / or dirt roads with obstacles. Professional bicycles for competitions and all kinds of races are equipped with hydraulic disc brakes. They are more complicated and very expensive, so it is very rare to find them within the city.
We will talk separately about setting up rim and disc brakes. most likely they are installed on your bike. If the bike has ordinary foot brakes, and trouble has happened to them, then there is no point in reading the article further. you need to go to a bicycle workshop. The fact is that replacing the foot brake pads is not an easy task, it is better to entrust it to the master, he will definitely not waste precious time, and will do everything well.
How To Fit & Set Up Shimano Road Bike Hydraulic Disc Brakes | GCN Tech’s Full Setup & Installation
As we said, they are mechanical and hydraulic, the former are most likely on your bike, and the latter must be carried to the workshop for service. This is due to the fact that the hydraulics are very sensitive, moreover, it is desirable to have a compressor and learn to understand the compositions, purpose and methods of replacing brake fluid. In winter, less of it is needed so that the course is freer, and more in summer. The ability to maintain hydraulics will come to you with experience. try to observe the work of the master, let him do everything in front of your eyes, so you will quickly learn and in the future you will be able to service the bike yourself.
Before adjusting the brakes, inspect the system for obvious damage. as with rim brakes, they are visible to the naked eye. Pay special attention to examining the rotor: if it has cracks or chips, you will have to change it. you cannot ride with such a rotor, it is dangerous for you and for the brake system, and for the bike in general.
The main “ailment” of disc brakes is the wrong angle and tightness of pressing the pads against the rotor. There are pads on disc brakes in a caliper, which is attached simultaneously to the frame and fork of the bike using a connector. To adjust this moment, you need to do the following.
- Remove dirt and turn the wheels to the “ready to ride” condition.
- Then slightly loosen the caliper mounting screws, and press on the brake. this is how we see how it works and where the “travel” problems arise.
- Having determined at what angle the pads fit most effectively to the rotor, and how the caliper should stand at the same time, secure it with the fixing and adjusting screws. This will not be easy, so take your time. even if you spend an hour on fixing and adjusting, then you will be one hundred percent confident in your bike.
The last thing to do with disc brakes is to tighten or loosen the cables. This is done in the same way as on rim brakes. the mount is untwisted, the cable is pulled over, the mount is twisted.
How to set up the brakes on a bike?
Now you have set the brakes, and are ready to go about your business. just go for a drive, to work, or even on a trip. But don’t rush to skate right away! To get started, you will need to ride the bike for at least an hour, taking with you a screwdriver and a hexagon. In real conditions, the brakes can behave completely differently than “in the workshop”. they will have to be tightened up, adjusted and even slightly “moved”. In any case, even if there are no problems, you will definitely need to make the brakes “softer” or vice versa, “harder”, this is where hex screwdrivers come in handy.
Once you learn how to adjust the brakes, you can think of yourself as a professional cyclist. this way you not only save personal time and money, but also get to know your bike better. The next stage is setting up the transmission, we will also master this, you can go to work with full confidence in the workshop.
Good luck with your work, peace of mind, a clear view and an easy road.!
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How to set up the brakes on a bike
How to set up the brakes on a bike
The question of how to set up disc brakes on a bicycle is extremely rare for owners of respective vehicles. Unlike rim pads, which require preventive maintenance at least once a season, disc adjustments are performed much less frequently, usually no more than once every 2-3 years. Except in cases of prolonged downtime and obvious signs of incorrect operation. Here, surgical intervention with subsequent adjustment measures is simply necessary.
Experienced cyclists are familiar with the list of causes of a faulty braking system or situations where additional adjustment is indispensable.
The main reason for incorrect operation is worn pads. Buying a new vehicle is always accompanied by its individual adjustment. If you become the owners of a brand new two-wheeled “friend”, then its mechanisms need to be run in, and also adjusted in several approaches. Cold storage, in other words, “great”, which has been in an unheated room for a long time, needs additional examination of the pads and the brake system.
Another reason to think about the health of your vehicle and its mechanisms is the appearance of extraneous sounds. Any knock, creak or whistle indicates only one thing. not all bicycle systems work properly. As a rule, problems are related to the block or other mechanisms.
Brakes that do not respond well to the force you apply also indicate hydraulic or cable malfunctioning. Mechanical damage found during a visual inspection or after a collision must be repaired in a timely manner. Even if the braking system continues to function, one should not neglect its adjustment or replacement of individual components.
The open mechanism of rim brakes greatly simplifies the procedure for their maintenance. Cyclists know how to set up rim brakes on a bicycle, but first you need to decide on the type of brake connection. Pads with V-Brake mount do not require special maintenance, basically manipulation with them comes down to replacing worn-out elements.
A slightly outdated type is cantilever. Unlike the V-Brake, the mechanism of this attachment has a more complex device. There is an additional cable here, it is called the central one and is responsible for connecting both sides. Another characteristic difference is the large clearance. Bikes with this system are ideal for “dirty” riding.
The caliper brakes feature a U-shaped retention mechanism. A pair of levers are connected to effectively “bite” the rim. This is the most difficult type of mount and requires special skill to adjust it. Most two-wheeled vehicle owners are only familiar with the V-Brake type, as it is the most common type.
When dismantling the brake system, observe the following sequence:
- release the brakes and, using force, remove the cable jacket from the holder;
- unscrew the mount, which is responsible for fixing to the frame;
- directly remove the brake mechanism;
- if it is necessary to replace the pads, unscrew the screw responsible for fixing them.
The last step is to remember the sequence of washers well. Usually they come in two, subsequent adjustment depends on their correct installation.
The rim brake pads are renewed or replaced depending on the degree of wear. For renewal, it is enough to degrease the surface of the contacting elements and remove a small layer of rubber that has become unusable. For replacement, it is necessary to remove the fixing screw and pry off the old shoe and then replace it with a new one. Even if the new thing did not fit in size, do not rush to despair, the parameters are easily “adjusted” with a knife, provided that you are not holding a cartridge column.
After a successful replacement, you can start adjusting. The rim brakes are adjusted by changing the pad mounting geometry and cable tension. To do this, use a special screw, which is located on the brake lever. Excessive cable length can simply be cut. After replacement, new pads can move in any plane. The chock should be flush with the rim, this is the correct position. In the process of checking, special attention is paid to the position of the pads; when braking, it should fit snugly against the rim over the entire area, while driving, it should be parallel to the rim. If all points are observed, the screws are installed in their original position and a control check of the brake system is carried out.
It is more difficult to set up hydraulic brakes on a bike. They are practically not found in modifications of the budget segment, rather it is a companion of a professional vehicle. The main feature of the hydraulic system is the use of brake fluid, otherwise working with it will not cause any particular difficulties. When starting to adjust the hydraulics, it is necessary to ensure that the wheel is evenly fixed in the position in which you move on it. This step is important for the hub and rotor. The brake adjustment is based on the caliper. First you need to loosen the bolts, the caliper should be movable, but not fall. Then squeeze the brake lever. the caliper will be in the desired position. At the final stage, you should check the clearances, tighten the bolts.
In addition to adjustment, the disc brake rotor needs to be replaced or straightened. If the defect is not strong, then replacement can be avoided by tightening the crooked place with an adjustable wrench. The disc mechanism is characterized by a high sensitivity to oily agents, therefore, cleaning and adjusting the system must be carried out extremely carefully. A small amount of oil left on the fingers can get inside. Use a degreasing product to adjust the rear brake of your bike. After partial disassembly, the “large” chain and the carriage should be covered, preventing the ingress of oily liquid into the mechanism.
The principle of operation and the device of bicycle disc brakes
According to the principle of operation and design, a disc bicycle brake is a system for transmitting force from the handle to the pads, which are pressed against the rotor mounted on the wheel hub. This transfers the braking force from the rim to the rotor, which contributes to more efficient and predictable bike behavior in rain, mud or snow.
The braking system consists of several components:
- brake lever on the handlebars of the bicycle;
- power transmission drive. cable or hydraulic master cylinder with hydraulic line;
- caliper. a device that provides pad travel depending on the drive force;
- adapter. a means of attaching the brake unit to the bike frame.
The pads and the rotor are in direct contact with each other, providing braking depending on the force transmitted by the drive.
Mechanical drive and brake settings
To set up a mechanical (cable) bicycle disc brake, you must make sure that the main components. cable, pads, caliper and rotor. are installed correctly and in good working order. You cannot use a bike if:
- there are damage to the cable, broken threads, weaving disorders, loose ends;
- the rotor is deformed, the distance between it and the pads is uneven when the wheel rotates;
- there is a backlash of the adapter and caliper.
To adjust, it is necessary to tighten the cable on the handle (-1.5 turns) and, using the calibration screws on the caliper, achieve the minimum distance between the pads and the brake rotor. It is inadmissible to touch parts when the handle is released.
How To Set Up Cable Disc Brakes On A Bike| Bicycle Maintenance Basics
How to properly set up disc brakes on a bicycle?
Bicycle disc brakes are not always included, but you can purchase and install this device yourself. There are two basic schemes for implementing this useful improvement. the brake can be mechanical (cable) and hydraulic.
Installation of disc brakes with different types of drive
To install a mechanical disc brake on a bicycle, you first need to fix the handle on the handlebar with a clamp, then pull the cable and fix it in the handle. Caliper assembly with pads is mounted to the frame using an adapter and connected to the handle with a cable.
Installation of a hydraulic brake on a bicycle practically does not differ in actions, since the role of a transmitting cable is performed by a hydraulic line with a working fluid. The master cylinder acts as a hydraulic reducer and a bypass valve that creates excess pressure when the handle is clamped. Pad travel is provided by a piston mounted in the caliper assembly. The system begins to work correctly after the final adjustment, which will be discussed separately.
Bike brake hydraulic drive settings
Adjusting a hydraulic bicycle brake differs from adjusting mechanics in that the handle is locked in a clamped position so that the fluid in the master cylinder passes through the channels and reaches hydrostatic equilibrium. After that, the handle is released and the minimum distance between the pads and the rotor is set. After installation, it is important to make sure that there are no leaks of working fluid in the hydraulic system, no deformation of the rotor, more backlash than indicated by the manufacturer. The large distance between the rotor and the pads has the effect of increasing the free stroke of the piston, which can lead to slower brake response. In case of characteristic jerks during braking, check the wear of the pads and the deformation of the rotor.