3.8. Check of the brake system

The dust which is formed as a result of wear of slips and accumulating on components of the brake mechanism may contain asbestos hazardous to health. Do not blow this dust by means of compressed air and do not inhale it!

Do not use solvents on the basis of gasoline for removal of dust. Dust should be washed away a special cleaner of the brake system or methyl alcohol in drain capacity.

After rubbing of components of the brake system a damp rag this rag and contents of drain capacity should be held in the closed and signed container. Further whenever possible try to use the components which are not containing asbestos.

Except checks through the established time intervals a condition of brake mechanisms it is necessary to carry out every time at removal of wheels or at emergence of signs of malfunction in system.

For driving safety the procedures of check of the brake system described below are the most important of all procedures for service of the car made by you.

Signs of malfunctions in the brake system

Disk brake mechanisms can have the built-in indicators of wear of frictional slips which signal that wear of slips reached critical size. At the same time slips should be changed immediately, otherwise brake disks will be damaged and they will need expensive repair.

Any of the listed below signs can indicate potential defect of the brake system:

   a) When squeezing a pedal of a brake the car "takes away" in one party;
   b) Brake mechanisms when braking make the scraping or squealing sounds;
   c) The pedal of a brake has the excessive course;
   d) The pedal of a brake pulses (it normally only during the work of the ABS system);
   e) Leak of brake fluid is observed (usually on inside of the tire or a wheel).

In case of detection at least of one of these signs immediately examine the brake system.

Brake lines and hoses

In the brake system steel brake tubes, except for the flexible reinforced hoses at forward wheels and as connections at the back bridge are generally used. Regular survey of all these lines is very important.


1. Park the car on the flat platform and switch off the engine. Take off caps from wheels. Weaken, but do not remove bolts of fastening of all four wheels.
2. The car and reliably establish to Poddomkratta it on support.
3. Remove wheels (see Poddomkrachivaniye's Section and towage in Introduction to the present manual).
4. Check all brake lines and hoses for existence of cracks and attritions in their external covering, leaks, swellings and deformations. Check brake hoses in forward and back parts of the car for existence of signs of a softening, cracks, deformations or wear as a result of friction about other components. Check all nipple connections for existence of signs of leaks and make sure of reliability of fastening of all bolts and clips of brake hoses.
5. Bend hands in one and other parties a brake hose to reveal damages. It is not necessary to twist hoses, - be guided on the color line put on a hose.
6. Turn a steering wheel to the right and to the left against the stop. Hoses should not touch car design elements at the same time.
7. At detection of leak of liquid or their damages it is necessary to eliminate immediately. For more detailed description of the procedure of repair of the brake system address the Head the Brake system.

Check of thickness of brake shoes

Thickness of external brake shoes can be checked through an aperture in a wheel disk by means of a pocket small lamp. The internal block can be checked by means of a pocket small lamp and a mirror. If it is necessary to estimate more precisely block thickness, it is necessary to remove a wheel and to measure a block by a caliper.

Disk brake of a forward wheel

Experience shows that wear of a brake shoe of a wheel from the forward passenger is more, than from the driver. Therefore for check of thickness of a brake shoe it is recommended to remove a wheel from the forward passenger. Observations show that 1 mm of wear of a brake shoe corresponds to at least 1000 km of a run of the car. This rule corresponds to adverse service conditions of the car. In normal conditions wear of blocks is much less. At a thickness of block of 10.0 mm (with a podkladny plate) the block can be operated still not less than 3000 km.


1. Mark paint the provision of a forward wheel in relation to a nave. It will allow to establish the balanced wheel in the working situation. Weaken bolts of fastening of a wheel. At the same time the car has to stand on the earth. Lift a forward part of the car and establish on supports. Remove a forward wheel.
2. Measure by a caliper the cumulative thickness of a frictional slip with a metal substrate on internal and external brake shoes.
3. Thickness of 7 mm is considered a limit of wear of a forward block (taking into account a substrate). In this case the brake shoe needs to be replaced, see the Head the Brake system.
4. Establish a forward wheel so that the markings put at removal coincided. Do not grease bolts of fastening of wheels. Establish bolts of fastening of a wheel.
5. Lower the car on wheels and tighten bolts cross-wise.

Disk brake of a back wheel


1. Check thickness of an external brake shoe through an aperture in a wheel disk, having used if necessary a pocket small lamp. The disk of a wheel does not need to be removed. If there is a wheel cap, it needs to be removed.
2. Check an internal block by means of a lamp and a mirror.
3. A limit of wear of a brake shoe of back and forward wheels thickness of 7 mm, including a podkladny plate is considered.

Parking brake

To protozoa, and it is possible, the most obvious way of check of operation of the parking brake is installation of the car on a steep slope with the cocked brake and transmission in neutral situation (when checking you should be in the car). If the parking brake does not keep the car from rolling, it is necessary to make its adjustment (see the Head the Brake system).