3.16. Check state / service of disk brake mechanisms

Remember that the dust produced when functioning brake mechanisms may contain extremely unhealthy asbestos of the person. Do not blow off dust compressed air at all and do not inhale it, at service of mechanisms put on a protective mask or a respirator. Do not use for rubbing of components of the brake system gasoline or solvents on an oil basis at all - apply only company cleaners or methyl alcohol! Try to use when replacing blocks only the components which are not containing asbestos.

More detailed illustrative material in the Head the Brake system.


1. The condition of components of the brake system, besides the regular, stipulated schedule of routine maintenance, checks, has to be estimated every time at removal of wheels or at emergence of signs of violation of functioning of system. Blocks of disk brake mechanisms are usually equipped with the special indicators notifying on excessive wear of frictional slips characteristic squeal when braking. The listed below symptoms can be a sign of malfunction of components of brake mechanisms:

a) When braking the car loses course stability (there is a withdrawal in one of the parties);
b) During braking brake mechanisms publish squeal or a scratch;
c) Excessively the course of a pedal of a foot brake increases;
d) When squeezing a brake pedal pulsations are felt;
e) Traces of leak of brake fluid take place (usually on an internal surface of disks of wheels and tires).
2. Weaken bolts/nut of fastening of wheels.
3. The car also establish to Poddomkratta it on props.
4. Remove wheels.

5. The support of each of brake mechanisms is equipped with two blocks, - internal and external. End faces of blocks are well looked through through a special observation port in the support case after removal of a wheel.

6. Assessment of residual thickness of a frictional overlay of an internal block is made visually through the observation port mentioned above. If slips are worn-out over an admissible limit (see Specifications), it is necessary to make complex replacement of brake shoes.

Remember that frictional overlays of a priklepana or are pasted to a metal substrate which thickness should not be considered at measurement.

7. If visually to estimate the residual thickness of slips it appears difficult, or there is a need for more detailed survey of blocks, remove a support(s) and take blocks for more detailed studying (see the Head the Brake system).
8. After blocks are taken from a support, clear them by means of special means and measure the residual thickness of slips by means of a ruler or a caliper with a vernier scale.
9. Measure by a micrometer thickness of brake disks. Compare results of measurements to standard requirements (see Specifications). If thickness any of disks leaves abroad admissible range, replace it (see the Head the Brake system). If thickness of a disk is normal, check its general state. Pay attention to such defects as deep scratches, furrows, teases, overheat traces, etc., in case of need remove a disk and send him to a pro-point (see the Head the Brake system).
10. Before establishing to the place of a wheel, examine all brake lines on existence of signs of damages, wear, destruction as a result of aging of material, traces of leaks, bends, twisting and other deformations (in particular near points of connection of flexible brake hoses to supports of brake mechanisms). Check reliability of fastening of hoses collars. Make sure that any of brake hoses do not adjoin to acute angles of the components of a body, system of production of the fulfilled gases located in the neighbourhood or suspension brackets (at any provisions of a steering wheel). In case of need make the corresponding repair or correct a route of laying of lines. Replace defective components (see the Head the Brake system).