3.29. Check state / service of drum brake mechanisms


1. Remove brake drums (see the Head the Brake system).

2. Make careful cleaning of brake mechanisms with use of the special cleaning structure.

Do not blow off brake dust from a surface of components compressed air at all and do not inhale it - dust may contain asbestos, harmful to your health!

Estimate the residual thickness of frictional overlays of brake boots (forward and back), check components for existence of traces of pollution by brake fluid and oil. If the frictional slip acts over heads of rivets / a metal substrate of assembly less than on 1.6 mm, boots are subject to replacement in a set (see the Head the Brake system). Boots should be replaced also in case of identification of cracks, zapolirovanny to gloss of sites of slips, or traces of hit of brake fluid.

3. Make sure of correctness of connection and serviceability of a condition of all springs of assembly of the brake mechanism (see the Head the Brake system). The neglect replacement of the deformed or weakened springs is fraught with premature wear of boots as a result of "prikhvatyvaniye" of brakes.
4. Check assembly components for existence of traces of leak of brake fluid. Having carefully hooked a finger or the small screw-driver, remove rubber boots from the wheel cylinder in the top part of boots. Identification of any signs of leaks in these parts demands carrying out immediate recovery repair of assembly of the cylinder (see the Head the Brake system). Also check all brake hoses and their nipple connections for existence of traces of leaks.
5. Carefully wipe the internal surfaces of the reel with the pure rags impregnated with methyl alcohol. Try not to inhale the brake dust containing asbestos. Examine the working surface of the reel on existence of cracks, zadir, traces of an overheat and other damages. If defects cannot be removed by processing of a surface with a fine-grained emery paper, the drum should be given for a pro-point to a workshop of car service (see the Head the Brake system).
6. Repeat the procedure for components of the opposite brake mechanism. Install into place reels, fix wheels and lower the car on the earth. Tighten wheel nuts with the required effort.