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 not containing asbestos components.

Except checks through the established time intervals a condition of brake mechanisms it is necessary to check 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 be equipped with the built-in indicators of wear of frictional slips signaling need of immediate performance of replacement of blocks in order to avoid failure of brake disks.

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

  1. When squeezing a pedal of a brake the car "takes away" in one party;
  2. Brake mechanisms when braking make the scraping or squealing sounds;
  3. The course of a brake pedal is excessively big;
  4. Squeezing of a pedal of a foot brake is followed by the pulsations which are not connected with ABS operation;
  5. Leak of brake fluid takes place (usually on inside of the tire or a wheel).

In case of identification of any of the listed above symptoms though it is necessary to make immediately check of a condition of components of the brake system.

Brake lines and hoses

In a hydraulic path of the brake system mainly steel tubes are used, - the exception is made only by the flexible reinforced hoses serving for connection of tubes with wheel cylinders. The condition of flexible brake hoses has to be checked on a regular basis.


  1. Park the car on the flat horizontal platform and kill the engine. Take off caps of rims. Weaken, but do not turn out bolts of fastening of all four wheels.
  2. The car also establish to Poddomkratta it on props.
  3. Remove wheels.
  4. Check all hydraulic lines and hoses of a brake path for existence of cracks, attritions, swellings, deformations and signs of development of leaks. Make sure of lack of signs of friction of brake lines about elements of a suspension bracket and steering. Attentively examine all nipple connections of a hydraulic brake path on existence of signs of development of leaks, check reliability of fastening of nipple bolts and nuts.
  1. Bending flexible brake hoses in different directions, make sure of lack of signs of their mechanical damage (see сопр. illustration). Track that the established hoses were not overwound, - as a binding it is possible to use the longitudinal color strip applied on a hose surface.
  1. Having rotated a steering wheel, make sure that flexible brake hoses of forward brake mechanisms do not adjoin to elements of the steering drive.
  2. In case of identification of signs of development of leaks the causes of the last have to be immediately removed.

Check of thickness of brake shoes


  1. Assessment of residual thickness of frictional overlays of external brake shoes can be made visually through an aperture in a rim by means of a pocket small lamp. Survey of an internal block in addition requires a mirror. More exact check of a condition of brake shoes is made after their removal, - measurement of thickness of frictional slips requires a caliper.

Disk brake mechanisms of forward wheels

Experience shows that wear of a brake shoe of a wheel from the forward passenger is most often higher, than from the driver in view of what survey always should be begun with the right board of the car. According to statistics, about 1 mm of wear of blocks is the share of 1 thousand kilometers of a run under adverse conditions. In normal conditions wear of blocks is much less. Really, at a residual thickness of a block of 10.0 mm (taking into account a metal substrate) she can be exploited by at least 3000 more km.


  1. Mark with 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 wheel bolts, then a front of the car and establish to a poddomkratta it on props. Remove the right forward wheel.
  2. Measure by a caliper the cumulative thickness of a frictional slip with a metal substrate both blocks of the brake mechanism.
  3. The limit of wear of forward blocks when replacement has to be made immediately, makes 7 mm. The description of the procedure of replacement of blocks is provided in the Head Tormoznaya and auxiliary systems.
  4. Having tracked for combination of the tags put in the course of dismantle, establish into place a wheel. Without greasing with anything, screw wheel bolts.
  5. Lower the car on wheels and, moving in a diagonal order, tighten bolts with the required effort.

Disk brake mechanisms of back wheels


  1. If that is established, take off a decorative cap and through an aperture in a rim visually estimate the residual thickness of an overlay of an external brake shoe, - in case of need use a pocket small lamp.
  2. For survey of an internal block use a mirror.
  3. As well as for forward brake mechanisms the minimum admissible thickness of back blocks makes 7 mm (a slip + a substrate).

Parking brake


  1. To protozoa, and it is possible, the most obvious way of check of serviceability of functioning of the parking brake is deduction of the car on abrupt descent in the neutral provision of transmission, - the driver has to be in the place in the car. If the parking brake is not capable to hold the car, it is necessary to make its adjustment (see the Head Tormoznaya and auxiliary systems).