Brake pedal
1 - vacuum amplifier; 2 - pusher; 3 - brake pedal; 4 – the buffer of the stoplight switch; 5 - switch nut; 6 - stoplight switch; 7 – retractable pedal spring; 8 - master cylinder
The brake pedal free play with the engine off should be 3–5 mm. This value is obtained by adjusting the position of the switch 6 (see fig. Brake pedal) stop signal.
If the brake light switch is too close to the pedal, then it does not return to its original position, the valve 9, pressing against the housing 22, separates the cavities A and E, and the wheels are not completely released when the pedal is released (see fig. vacuum booster).
The position of the brake light switch is adjusted by moving it with the nut 5 released. Install it so that the brake light buffer slightly touches the pedal stop, while the pedal free play should be 3–5 mm. After adjustment, tighten the nut 5 (see fig. Brake pedal).
Attention! Adjust the brake pedal free travel with the engine off.
If by moving the brake light switch it is not possible to eliminate the incomplete release of the brake mechanisms, then disconnect the brake master cylinder from the vacuum booster and check the protrusion of the adjusting bolt 28 (see fig. vacuum booster) relative to the mounting plane of the master cylinder flange (size 1.25 mm). This dimension can be set by holding the end of the rod 3 with a special key, and turning or unscrewing the bolt 28 with another key.