For check of thickness of back brake shoes, without removing brake drums, remove rubber caps from the protection cover of a back brake and light
Fig. 2.20. An opening arrangement on the protection cover of the back brake closed by a rubber cap for survey of back brake shoes
small lamp through openings on brake shoes
. Visually determine thickness of brake shoes.
If it is visually difficult to determine thickness of brake shoes or there is a suspicion on an unsatisfactory condition of blocks, remove them for further survey.
Install the car on the firm horizontal platform.
Enclose under forward wheels an emphasis for prevention of swing of the car.
Weaken bolts of fastening of back wheels, lift a back part of the car and fix on supports. Remove back wheels.
Remove brake drums.
Measure by a caliper thickness of overlays of back brake shoes. If overlays of brake shoes are higher than heads of rivets on 1,6 mm, brake shoes are suitable for further operation, otherwise replace all four brake shoes in a set.
Replace brake shoes also in case overlays of blocks have cracks, are greased or polluted by brake fluid.
Check a condition of the returnable and holding springs of back brakes.
Turn off protective covers of working brake cylinders and check lack of leak of brake fluid. If under protective covers there is a brake fluid, replace working brake cylinders.
Check a condition of brake drums for lack of cracks, scratches, deep flutes and traces of an overheat. If defects cannot be eliminated, replace brake drums.
Install brake drums.
Establish wheels and lower the car.