How to swap the brakes on a bike

Braking system characteristics

The following terms are used to qualitatively describe the operation of rim brakes:

  • impact force;
  • efficiency;
  • wear resistance;
  • modulation;
  • service requirements;
  • comparative features.

How To Switch Your Front And Rear Brakes

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 only required 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 handle is called modulation, or accuracy, of the brakes.

An active cyclist uses his transport 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.

Replacing pads on a bicycle

The construction of a bicycle today must certainly be of high quality and durable, so that every rider has the opportunity to 100% enjoy the ride or walk. The most extreme versions of bicycles are considered BMX, because with their help you can really perform tricks and various variations in the air. The main prerequisite for complete comfort and confidence in riding are the brakes of the bike. Indeed, their serviceability, functionality and efficiency will prevent the occurrence of unpleasant situations and incidents during the movement of the cyclist.

Disc brakes

A bicycle disc brake is a combination of a steel disc (rotor) located on a hub with a caliper. a device that actually clamps the disc with the brake pads. From the brake lever on the handlebar, the force is transmitted to the brake by a cable (mechanical disc brake type) or through a hydraulic mowing line (hydraulic disc brakes).

brakes, bike

Bicycle disc brakes also have their advantages. They are:

  • less clogging when driving;
  • can work without problems while driving on snow or mud;
  • as smoothly as possible (in contrast to rims) adjust the braking force;
  • do not react to slightly curved wheel geometry (small “eights” are not a hindrance for them);
  • do not affect the wear of the rim;
  • and do not require expensive maintenance.

Many bicycle disc brakes have only one moveable brake pad. The second is fixed statically relative to the frame structure. This greatly simplifies and reduces the cost of the caliper. But, however, as the wear and tear, the cyclist will have to tighten the brake pad, which is stationary.

Brake discs are standard sizes. These are 140, 160, 180, 185, 203 or 220 millimeters.

disadvantages

Brake pads also have their disadvantages in the form of:

  • Front disc brake pushes very hard on one blade of the front fork, requiring a stronger, heavier fork, resulting in intense fork-free riding.
  • Disc brakes require special hardware on the frame and fork, as well as specific hubs.
  • The front disc brake caliper behind the forks creates a powerful force to loosen the quick release and pull the wheel out of the fork. To overcome this problem, you need a dedicated hub and fork with a hole, not a slot for the axle.
  • Disc brakes and related parts usually make the bike heavier than a simple rim brake.
  • These brakes are more complex, expensive and more difficult to maintain than rim brakes or drum brakes. This is especially true for hydraulic disc brakes, the most effective.
  • This type of brake restricts the freedom of movement of the hub to the right or left, rearranging the spacers on the axle, as this changes the position of the rotor. The caliper must be moved by the same amount. The wheel and frame cannot be replaced by others.
  • Disc brakes can interfere with luggage racks and fenders.
  • Can prevent quick wheel changes if needed by riders.
  • The brake disc with bike rack is vulnerable and can be bent easily. Other hub brakes do not have this weakness.
READ  How to bleed shimano hydraulic brakes on a bike

We set the levers symmetrically

In order for the left and right pads to wear evenly, they must be at the same distance from the rim. Adjustable by spring tension on the brake levers. To equalize the force that returns the left and right brake levers to their original position, use the adjusting bolts located at the base of the levers.

By twisting the bolt clockwise, we tighten the spring, unscrewing it. weaken it. By pressing and releasing the brake, we check the uniformity of the removal of the pads from the rim. Tighten the bolts on the left and right sides until the pads move the same distance when the brake lever is released.

Rim brakes

The operating principle of rim brakes is extremely simple. On the bicycle handlebar there is a brake lever, from which a special cable (or a hydraulic line is laid) is pulled to the brake pads located on both sides of the bicycle wheel rim. When the handle is pressed, the rim is compressed by the pads, after which the wheel rotation slows down and comes to naught.

There are two types of rim brakes, which in turn are subdivided into several subtypes:

  • Mechanical brakes including:
  • vector (V-brake or “vibrake”) with V-shaped attachment of the levers to the brake pads;
  • tick-borne (“crabs”) with U-shaped levers;
  • and cantilever (obsolete predecessors of V-brakes).
  • Hydraulic brakes, in which the applied force is transmitted from the handle to the pads by the brake fluid along a specially laid hydraulic mowing line.

Rim brakes have a number of clear advantages over other types of bicycle brakes:

  • Low loads on bushings and spokes.
  • Less braking heat.
  • Easy setup even in the field.
  • Low weight of the actual brake.
  • Not a high price at all.

Advantages and Disadvantages of Disc Brakes

Like every design, disc brakes have their own pros and cons. Among the advantages, it is worth noting the following:

  • Disc brakes with large rotors are strong.
  • Low leverage with superior disc brakes.
  • Disc brakes must not flex over the tire, so no design compromises are required for wide tires.
  • They are little affected by wet conditions.
  • They are not clogged with dirt and snow.
  • Not susceptible to rim damage.
  • Brake pads won’t damage the tire or dive under the rim without locking the wheel.
  • External to the hub, they do not impose any special lubrication requirements, which prevents the hub from overheating on long steep descents.
  • Dissipates heat without overheating the tire, which is especially important when used as a downhill brake or cargo bike.
  • They have no rims, which is important when driving in sand and mud, or with carbon fiber composite wheels. They do not leave black dust (particle wear) on the aluminum alloy rims, making replacement parts a clean job.
  • Allows modifications that do not work with rim brakes such as reflective tape on the sides of the rim, tire chains wrapped around the rim and tires.
  • Allows you to switch wheels with different rim sizes to the same frame, so you can switch from skinny road tires to rough off-road tires while maintaining the same bottom bracket height.
  • Hydraulic disc brakes eliminate cable friction “stickiness”.
  • Some hydraulic disc brakes self-adjust to compensate for rotor wear.
  • The rotor can be easily replaced when worn or damaged. Adapters allow replacement of most calipers, even those types that are no longer produced.
  • Some bike frames must use rim brakes as there are no presets for mounting rim brakes.
READ  How to Ride a Big Bike

Checking the condition of the brakes

First of all, “unfasten” the brake, as shown in the photo.

Check how the cable (G) moves in the shirt (A) by pressing and releasing the brake lever and pulling the cable back with your finger. the movement should be free, without delay. If the cable pulls hard, it may be damaged, the shirt or cable guide (C), or dirt has accumulated inside the jacket or cable guide. They must be removed and cleaned or replaced.

Check the condition of the pads (J). They should show dirt drainage grooves (the block should not be smooth). Worn pads without grooves must be replaced. Check that the pads are complete with washers and that they are correctly installed.

Observe the order of the washers when installing new pads.

The brake levers (I) must rotate freely in their seats and spring apart after being compressed. If the movement is difficult, the brake during operation may get stuck in the closed position and rub the pad on the rim. In this case, you can remove the levers from the seats, clean and lubricate the contact points and reinstall.

When installing, make sure that the protruding pin on the arm fits into the hole in the frame, and that the hole on the left and right arm is the same.

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 brakes. over, each type of brake system is subdivided into subspecies.

  • tick-borne;
  • cantilever;
  • hydraulic;
  • 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.

READ  7 Speed Bike Speed Control

How is the replacement carried out

The first sign that the brake pads are worn out is a squeal. What should be done in such a situation, and how to remove, replace the brake pads? The caliper is removed first. Many manufacturers have made the device lightweight and easy to replace. Then the wiring is removed, as well as the ring (retaining). This must be done so that the bolt does not loosen during future use, as this may cause the bike to malfunction. Then it is necessary to remove the bolts, which can be of several types:

  • Magura;
  • Shimano (curling);
  • Hope (snap-on).

After removal, each bolt is wiped clean. Such processes will now allow the worn out brake pads to be removed. It takes a little physical effort to do this. The removed pads need to be clearly seen, because in some cases they do not need to be replaced. You can see this by the special marks that manufacturers leave on the parts. There are two options for replacing the pads. semi-metallic or organic. It is also worth picking up a new spring, it must be identical to the old one.

After all the manipulations, new pads are installed along the rotor. It is worth being extremely careful in the process so that every detail is in the correct position. The final chord is to check the work done. If you drive correctly and periodically (once a month) pay attention to the performance and functionality of the brake pads and, in general, the bicycle, then you can significantly extend the life of absolutely all parts and spare parts, and at the same time enjoy your trips.

disadvantages

Brake pads also have their disadvantages in the form of:

  • Front disc brake pushes very hard on one blade of the front fork, requiring a stronger, heavier fork, resulting in intense fork-free riding.
  • Disc brakes require special hardware on the frame and fork, as well as specific hubs.
  • The front disc brake caliper behind the forks creates a powerful force to loosen the quick release and pull the wheel out of the fork. To overcome this problem, you need a dedicated hub and fork with a hole, not a slot for the axle.
  • Disc brakes and related parts usually make the bike heavier than a simple rim brake.
  • These brakes are more complex, expensive and more difficult to maintain than rim brakes or drum brakes. This is especially true for hydraulic disc brakes, the most effective.
  • This type of brake restricts the freedom of movement of the hub to the right or left, rearranging the spacers on the axle, as this changes the position of the rotor. The caliper must be moved by the same amount. The wheel and frame cannot be replaced by others.
  • Disc brakes can interfere with luggage racks and fenders.
  • Can prevent quick wheel changes if needed by riders.
  • The brake disc with bike rack is vulnerable and can be bent easily. Other hub brakes do not have this weakness.

How to Replace Brake Pads on a Bike. Rim Brakes