3.12.2. Check of the brake system

1. Unsatisfactory operation of the vacuum amplifier can be the cause of loss of efficiency of braking. For its express check press several times a brake pedal at the idle engine to remove depression in the amplifier, and then, holding a pedal, launch the engine. If after launch of the engine the pedal fell a little, the vacuum amplifier is serviceable.
2. If the pedal remained motionless, check an integrity and reliability of fastening of a hose to the backpressure valve of the vacuum amplifier and to an inlet pipe of the engine. Replace a faulty hose or repair. If the hose is serviceable, replacement of the vacuum amplifier is required (see section 9 "Brake system").
3. If braking is followed by a beating and a pulsation of a brake pedal, it is necessary to check first of all a condition of forward disk brake mechanisms.
Having installed the car on a jack, remove a forward wheel and check mobility of brake shoes. For this purpose through a window in a bracket try to move with the screw-driver blocks in support nests. If blocks cannot be taken away from a brake disk, so they lost mobility in nests of a support or "jammed" the piston in the brake cylinder.

Note
Jamming of the piston of the brake cylinder leads to constant snubbing of the corresponding wheel at the released pedal and a drift of the car when braking.

4. Check mobility of blocks. If they move with difficulty, clear face surfaces of the bases of blocks and a nest in a support of dirt and a rust, having provided absolutely free movement of blocks. At the same time check thickness of overlays of blocks. If it less than 1,5-2 mm, replace blocks.
5. Examine a brake disk. Thickness of a brake disk has to be not less than 20,4 mm. The surface of a disk has to be equal and smooth on both sides. If the disk surface in places is covered with a rust that usually happens after the long parking of the car to not dried brakes, try to smooth out a working surface a small emery cloth. If this procedure did not help, it is necessary to give disks to grinding or to replace new.