Each 15 000 km of a run of the car or once a year check thickness of forward and back overlays of brake shoes.

Disk brakes

You carry out an inspection of wear of overlays of brake shoes of disk brakes in the following order:

visually estimate thickness of brake shoes. If necessary use a portable lamp and a small mirror.

if visual survey is complicated, remove wheels;

measure thickness of external brake shoes together with the metal basis of a block. Determine thickness of internal brake shoes visually;

brake shoes of lobbies and back disk brakes reach a wear limit if their thickness makes 7 mm together with the metal basis of a block. In this case all brake shoes on one axis are subject to replacement.

NOTE Under the most adverse service conditions of the car wear of brake slips makes no more than 1 mm by 1000 km of a run of the car. At normal operation of the car the resource of work of brake shoes makes not less than 30 000 km of a run of the car.

Drum brakes

You carry out an inspection of wear of overlays of brake shoes of drum brakes in the following order:

Fig. 12.2. An arrangement of the stopper closing a viewing opening on a brake board

remove a stopper of a viewing opening from the inside of a brake board (fig. 12.2) ;

by means of a portable lamp visually estimate thickness of a brake slip;

if thickness of any slip decreased to 2,5 mm, replace all back brake shoes;

check whether there are no traces of oil and brake fluid on blocks.