3.15. Problems with brakes

The brake system of your car is supplied by the vacuum amplifier and is quite effective. Decrease in efficiency of braking, a car drift when braking have to become a signal for urgent check of brakes.

Preventions
Regularly check the level of brake fluid in a tank of the main brake cylinder. Level has to be at the level of a tag of "MAX" or is slightly lower than a tank of the main brake cylinder.
Falling of level of liquid demonstrates or leak of brake fluid from system, or about excessive wear of brake shoes. If in a combination of devices the lamp signaling about the low level of brake fluid lit up, you do not hurry to add it at once, in the beginning check thickness of overlays of brake shoes: can be, time to replace blocks came?

Producers of the car recommend to replace through a certain period all brake fluid in system. Some drivers scorn this opinion as liquid in a tank seems to them rather pure, and it is absolutely vain. The matter is that brake fluid is very hygroscopic — it absorbs moisture from air, and this moisture not only destroys over time the surfaces of brake cylinders, pipelines and, as a result, leads to premature failure of knots of the brake system, but also significantly reduces temperature of boiling of brake fluid. Normal temperature of boiling of the Neva brake fluid – 190 °C, Tom – 210 °C, "Dew" – 260 °C. At frequent intensive braking disk brakes of forward wheels very strongly heat up and at high content of water brake fluid can boil that, as a rule, leads to refusal of brakes.

Good advice
Not to subject itself in the future to contingencies for repair not only the brake system, but also all car, it is better to replace in due time liquid in the brake system.

If the brake pedal became "soft", and by several consecutive pressing becomes "firmer", so air got to the hydraulic brake drive. It could get to system at its repair, replacement of brake fluid, depressurization of system at damage of tubes and hoses, falling of level of brake fluid to a tank of the main brake cylinder.
For removal of air from system it is necessary to pump over brakes according to the technique stated in section 9 "Brake system" (see. "Pumping of a hydraulic actuator of the brake system").
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.
1. If the pedal remained motionless, check an integrity and reliability of connection of a hose of the vacuum amplifier with the union on an inlet pipe of the engine...
2.... and with the backpressure valve. Replace a faulty hose or repair. If the hose is serviceable, replacement of the vacuum amplifier is required (see. "Removal and installation of the vacuum amplifier of brakes").

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.
3. Having installed the car on a jack, remove a forward wheel and examine a brake disk. Thickness of a brake disk has to be not less than 17,8 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.
4. Check mobility of brake shoes. For this purpose the screw-driver try to take away blocks from a brake disk. If blocks cannot be parted, so in the brake cylinder jammed the piston.

Prevention
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.

Good advice
The parking brake puts in action back brakes the cable connecting the lever of the parking brake and the mechanism of management of brake shoes. Many drivers try to use as seldom as possible the parking brake to prolong his life, and achieve opposite result. If you do not use the parking brake, in covers of a cable dirt and moisture stands, the cable acquires a rust, ceases to move and breaks. Therefore use the parking brake in all cases, when necessary, but do not forget to adjust its drive from time to time.

According to manufacturer, the course of the lever of the parking brake has to make:
– at adjustment 2–4 clicks;
– in operation of 2-8 clicks.
Correctly adjusted parking brake has to hold the car on a bias of 25%.
If at a car zatormazhivaniye the parking brake the lever rises more than by 8 clicks, the car will not keep on a bias. If the course of the lever is less than 2 clicks, during the movement of the car partial blocking of wheels is possible. In both cases the parking brake should be adjusted according to the technique stated in section 4 "Maintenance" (see. "Check and adjustment of the drive of the parking brake").