3.15.2. Check of brake system

1. Unsatisfactory work of the vacuum amplifier can be the reason of loss of efficiency of braking. For its express check press some times a brake pedal at the idle engine to remove depression in the amplifier, and then, keeping a pedal, start up the engine. If after start-up of the engine the pedal has a little fallen, the vacuum amplifier is serviceable.	2. If the pedal remained motionless, check up an integrity and reliability of connection of a hose of the vacuum amplifier with the union on an inlet pipe of the engine …

3. … and with the amplifier. A faulty hose replace or repair. If the hose is serviceable, it is necessary to replace the vacuum amplifier (Replacement of the vacuum amplifier see).

THE NOTE The hose of the vacuum amplifier is made for a single whole with the return valve. Check up its working capacity (Check of work of the vacuum amplifier of brakes see). In case of malfunction of the return valve replace a hose of the vacuum amplifier in gathering.

If braking is accompanied by palpation and a pulsation of a brake pedal, it is necessary to check up first of all a condition of forward disk brake mechanisms.

4. Having established the car on a jack, serially remove forward wheels and examine brake disks. The thickness of a brake disk should be not less than 19,0 mm, a disk surface — equal and smooth from both parties. If the surface of a disk in places is covered by a rust that usually happens after long parking of the car to not dried brakes, try to smooth out a working surface small наждачным a cloth. If this procedure has not helped, it is necessary to give disks to polishing or to replace new.

5. Check up mobility of the piston of the brake mechanism. For this purpose try to get moving forward the piston a screw-driver. If the piston does not manage to be shifted, means, it has jammed in the brake cylinder.

THE PREVENTION Jamming of the piston of the brake cylinder leads constant притормаживанию a corresponding wheel at the released pedal and to car drift at braking.

If braking is accompanied by jerks of the car and a scratch around back wheels, and at intensive braking there is a drift of a back part of the car, check up a condition of drum-type brake mechanisms of back wheels.

6. Having established the car on a jack, serially remove back wheels, remove brake drums (Removal and installation of a brake drum see) and measure diameters of their working surfaces. Internal diameter of a drum should be no more than 201,0 mm, a working surface of a drum — equal and smooth, without ring рисок and obviously visible ovality (ovality should be no more than 0,5 mm, it can be defined on non-uniformly worn out worker of a surface of a drum). If internal diameter of a drum more admissible, ring risks very deep or is well visible non-uniform deterioration of a working surface, it is necessary to replace a drum new.

THE NOTE The lay brake puts in action back brakes the cables connecting the lever of a lay brake and mechanisms of management brake колодками. Many drivers try to use as seldom as possible a lay brake to prolong its "life", and achieve opposite result. If you do not use a lay brake, in covers of cables the dirt and a moisture stands, cables acquire a rust, cease to move and break. Therefore use a lay brake in all cases, when necessary, but do not forget to regulate from time to time its drive (Adjustment of a drive of a lay brake see).