How to make rear brakes on a speed bike

Cantilever systems

The prototype of the V-brake brakes. Gradually replaced by the latter due to a number of design flaws. The disadvantages include. insignificant braking power, the need for frequent regulation. Systems of this type, even expensive brands, take time and mileage to grind the pads. Until the end of the grinding process, the brakes function rather mediocre.

Caliper brakes

The appearance resembles a tick, with a similar working principle. The brake levers are in an X-shaped connection and are attached to the base frame at one point. Simplicity of design and easy setup do not bring this model to the top of popularity.

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The reason is the unreliability of the design and the relatively large weight. If lumps of dirt get in, misalignment, or deformation of the rim, the levers are skewed, which causes a number of additional problems. Including increased friction of the pads, and their premature wear. No less significant drawback. certain restrictions on the use of tires with a wide profile.

Installing v-brakes

The pads should be replaced with new ones when their braking surface is erased to the level of the grooves for the drain of dirt, that is, when the working surface becomes completely flat. And if the pads are worn out on only one side, this means that they were installed incorrectly, and they will also need to be replaced.

First, loosen the screw holding the cable.

The main thing when installing a conventional brake shoe is to put on in the correct sequence all the washers and gaskets that make up their fasteners. Also note that some models of pads can be divided into left and right, this is indicated on the pads themselves, take this into account when installing.

Replacing cartridge pads is even easier. They have a metal base and only the rubber pad needs to be replaced. There is a locking cotter pin on such pads (do not lose it), you need to pull it out and slide out the rubber pad. Then insert new pads and secure with a cotter pin. When installing the trims, pay attention to the indicators for the right and left side.

After replacing the pads, screw the adjusting drum on the brake lever fully and unscrew it one turn. Squeeze the brake levers with your fingers, reinstall the cable and secure with the screw. The distance from the wheel rim to the shoes should be 2 mm.

Scheme of work

The principle of operation of the system is based on the use of the friction force arising in the process of interaction of brake pads and wheel rim.

Structurally, any rim system includes:

  • paired levers for the front and rear wheels;
  • brake pads made of dense rubber;
  • control handles;
  • cables connecting all components;
  • brake cable covers.

The scheme of the kit is quite simple. When physically acting on the control handle, the force is transmitted through the cables to the levers with pads attached to them. There is a clamping of the wheel rim between the surfaces of the shoes. As a result, the bike slows down or stops. The more the application force, the more the rim is clamped, the faster the object slows down.

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Compared to other types of rim braking mechanisms, they have a lot of advantages: they are not expensive, easy to maintain and repair, have a high degree of modulation, practically do not have a harmful effect on the hubs and spokes of the wheel.

At the same time, this design has a number of significant disadvantages, which are recommended to be taken into account when choosing and purchasing a bike.

Setting rim brakes using the example of V-brake

When set up correctly, v-brakes will perform just as well, and some models even better than disc brakes! The design features of the v-brakes allow adjusting the pads in almost any plane, but this is not possible with caliper rim brakes. The price of rim brakes is significantly less than that of disc brakes, they weigh less and are easier to adjust than disc brakes.

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V-brakes systems

The vector design is by far the most advanced and popular version of rim brakes. Levers with attached pads are connected with a cable and adjoin the wheel in the form of a V. Characterized by ease of maintenance, high reliability, low weight.

In recent years, V-brake kits have been gaining ground in professional sports, overtaking disc-type systems. The reason is increased operational safety. For example, at the 2015 Tour de France race, a racer severely injured his hand as a result of a fall and hitting his forearm on the rotating disc brake rotor moving in front of the bike. Consequence. Many riders find it warranted to switch to vector brakes.

Hydraulic

The system includes design features and disadvantages of the above models. The main difference is that the moment of force is transmitted from the control levers to the working surfaces of the pads with the help of brake fluid, instead of cables. There is additional comfort, ease of control, brake sensitivity. However, according to many users, such tuning does not justify the high price and complexity of the repair. Therefore, these systems are considered a real exotic.

Adjusting the brakes on a bicycle

You suspect a malfunction of the brakes on the bike, strange sounds arose during braking and when you press the handle, the stopping mechanism does not work at all or works slowly, which means there is a need to adjust and adjust the system.

  • You need to start with the handle: when it is fully pressed, it should not reach the fingers of the hand, if, on the contrary, then you need to adjust it with a lock nut.
  • After we assess the backlash between the disc and the pads. you can put a light sheet of paper for a more visual adjustment, release the screws that attach the brake to the fork or adapter.
  • Next, loosen the screws for free wheeling of the brake.

Cantilever systems

The prototype of the V-brake brakes. Gradually replaced by the latter due to a number of design flaws. The disadvantages include. insignificant braking power, the need for frequent regulation. Systems of this type, even expensive brands, take time and mileage to grind the pads. Until the end of the grinding process, the brakes function rather mediocre.

Video

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Alignment of the hydraulic braking system

A pretext for repairing or adjusting a bicycle with disc brakes may be wheel spinning resistance and foreign noises when the brake lever is pressed. How to properly adjust disc brakes on a bicycle?

make, rear, brakes, speed, bike
  • It is necessary to loosen the screws on the caliper until they move freely, then squeeze the handle, while the pads must lean firmly against the hydraulic rotor.
  • At the same time, we check the gap of the hydraulic valves on the hubs, which should be parallel and be at the same distance from the rotor.
  • In the position of the pressed handle, tighten all the bolts on the caliper.
  • To check the operation of the device, you must release the handle and visually fix the backlash between the furry and the disk, which may not be larger than a hair.
  • In the case of irregular installation of the caliper, it is necessary to release and tighten the tightening of riveted cylindrical rods that have a screw thread on the surface of the caliper itself.
  • At the end of the adjustment, it is necessary to set the brake lever in the optimal position, while using the adjusting hexagon.

Adjusting the position of the pads

“Fasten” the brake by squeezing the levers and placing the cable guide (C) in the stop (D). Loosen the block fixing bolt (K) with a hexagon. We press the lever with the block to the rim and set the block so that it:

  • adhered to the rim with the entire surface
  • did not touch the tire
  • located parallel to the rim

In this position, the block must be fixed by tightening the bolt. When tightening the bolt, the block may move and must be corrected. It will be easier if you find an assistant who will grip and hold the brake lever while you tighten the bolt.

If your brakes squeal, try the following.

We do similar operations with the second block.

Adjustment tips

Correct adjustment and adjustment of the brakes is an important condition for the effective functioning of the system.

Based on the specific features of the rim kits, there are a number of conditions, the observance of which will help to achieve an optimal result during the adjustment process:

  • the rim, if possible, should not have deformations and damage;
  • the wheel must be dry, free from dirt and sand;
  • adjustment is carried out with a set of keys, hexagons and screwdrivers, sizes and calibers suitable for this purpose;
  • adjustment is carried out in accordance with the provided algorithm, and only undamaged system elements, with permissible production rates.

For vector mechanisms, such an algorithm includes the following actions:

  • Checking the vertical position of the brake pads relative to the wheel rim. The center axis of the brake surface of the pad must be centered on the brake track of the wheel rim. The shoe moves up and down in the corresponding grooves in the brake lever. Fixed in the desired position with elongated nuts.
  • Often, as a result of emergency braking, clogging of the inter-pad space with dirt, loosening of fixation, a slight rotation of the pad about its axis occurs. The result can be rubbing of the pads on the tire. The elimination of such problems is carried out in a similar way. The fixing nut is unscrewed, the block is set to its original position, the nut is clamped.
  • During operation, the pads wear out, the gap between the brake surfaces increases, and the braking efficiency decreases.
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Correctly performed adjustment operations result in a flawlessly functioning braking system. The following criteria are used to check the quality of the adjustment:

  • the pads are located parallel to the brake tracks of the rim;
  • the distance between the working braking surfaces varies within 1-1.5 mm;
  • visually the pads are fixed symmetrically in relation to each other;
  • adhesion of braking surfaces occurs synchronously on each side of the rim.

After completing the above measures, a mandatory performance check follows. Initially, it is carried out at idle speed. To do this, the front wheel is lifted off the surface and spins up. The control handle is clamped sharply. When set correctly, the wheel stops immediately. The rear wheel is checked in the same way. The next step is to test it in action. The bike accelerates over a short distance of 5-10 m, the brake lever is squeezed out sharply. If the bike stops halfway through the lever travel, the system has been serviced correctly, if not, the cause must be investigated and rectified.

Mechanical and hydraulic braking systems

There is a fundamental similarity with regard to the control of v-brake and mechanical disc brakes: in both cases, the force from the hand pressure lever to the brake is transmitted through a cable wound into the “jacket”, which is attached to the frame and / or to the steering fork. In hydraulic disc brakes, the transmission action takes place through pipes filled with brake fluid. The hydraulic lines are vulnerable to mechanical damage. In the event of a rupture or leakage, the hydraulic disc brake is completely ineffective. If air enters the hydraulic line (depending on the concentration of air bubbles), the performance of the brake system is completely or partially lost.

The undoubted advantages of the hydraulic option include the exceptional power of the maximum clamping and quick response to the control movement. In mechanical systems, the transmission of force along the cable occurs with a certain delay, which can affect the control efficiency, for example, during downhill descent. The complexity of the design of hydraulic disc brakes requires the creation of special conditions, if necessary, to carry out repair work. When both mechanical v-brakes and disc systems may well be repaired and / or tuned, as they say, in the field.

Hydraulic

The system includes design features and disadvantages of the above models. The main difference is that the moment of force is transmitted from the control levers to the working surfaces of the pads with the help of brake fluid, instead of cables. There is additional comfort, ease of control, brake sensitivity. However, according to many users, such tuning does not justify the high price and complexity of the repair. Therefore, these systems are considered a real exotic.