3.9. 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 for removal of dust solvents on the basis of gasoline.

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 the brake system.

Signs of malfunctions in the brake system

Disk brake mechanisms have the built-in indicators of wear of frictional slips signaling 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:

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 wheels are generally used. Regular survey of all these lines is very important.


  1. Park the car on the flat platform.
  2. The car also establish to Poddomkratta it on props then remove wheels.
  3. 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 details. Check all nipple connections for existence of signs of leaks and make sure of reliability of all fixture of brake lines.
  4. Bend hands in one and other parties a brake hose to reveal damages. It is not necessary to twist hoses.
  5. Turn a steering wheel to the right and to the left against the stop. Make sure that hoses at the same time do not touch car design elements.
  6. At detection of leak of liquid from brake lines or their damages of leak 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 and disks


  1. The car also establish to Poddomkratta it on props then remove the corresponding wheel.
  1. Check thickness of brake shoes and through an opening in a support of the brake mechanism.
  1. Thickness of 5.0 mm is considered a limit of wear of a block, in this case the block should be replaced (see the Head the Brake system).

As a rule, 1 mm of wear of a frictional overlay of a brake shoe corresponds to, at least, 1000 km of a run under adverse service conditions. In usual conditions of a slip are erased much more slowly.

  1. In case of doubt in correctness of measurement remove brake shoes and measure their thickness by a caliper. If degree of wear is already reached, replace brake shoes. It is necessary to replace all 4 blocks of wheels of one axis, even in case only one block wore out.
  2. Check supports of the brake mechanism for existence of leaks. At detection of leaks urgently repair a support.
  3. Visually check brake disks from internal and outer side for existence of furrows, a rust, cracks, if necessary replace disks.
  1. Measure thickness of brake disks in several places by means of a micrometer or a special caliper. It is also possible to measure thickness of a brake disk by a usual caliper, having enclosed from each its party a lining of the known size (for example, two coins), and then having subtracted lining thickness from the measured value.
  1. Compare minimum of the received results to requirements of Specifications to the Head the Brake system. If the limit of wear is reached, replace surely both brake disks of wheels on one axis. The brake disk should be replaced also at big cracks or deep furrows.
  2. In conclusion check integrity of indicators of wear of blocks and thickness of boots of the parking brake. Replacement of boots is recommended to be made if through a control opening in a disk 10 rounds of a carving are visible. Establish wheels and lower the car on the earth.

Check and adjustment of the parking brake

Location of an adjusting nut


  1. Park the car on a plain surface and release the parking brake.
  2. The car has to move manually, action of brakes should not be felt.
  3. Cock the lever of the parking brake. If wheels are not blocked after four clicks, adjust the parking brake in a way described below.
  4. Remove wheels and by means of the screw-driver unscrew the regulator so that the brake disk was blocked. Then tighten the regulator prior to the beginning of a provorachivaniye of a brake disk. Repeat the procedure on the second back wheel.
  5. Establish wheels.
  6. Check a stock of the course of the lever of the parking brake. For this purpose you will hang out back wheels and pull the lever before the first click.
  7. Tighten an adjusting nut on the lever of the parking brake, access to which is available through an opening in the central console until the brake does not begin to grab.
  8. Release the parking brake and cock it again. After 1 - 4 clicks wheels have to be blocked.