Figure 89. Brake pedal assembly with vacuum booster and master cylinder:
1 - master cylinder; 2 - tank; 3 - liquid level alarm sensor; 4 - vacuum booster; 5 - pusher; 6 - brake pedal; 7 - brake light switch buffer; 8, 9 - brake light mounting nuts; 10 - brake light switch; 11 - pedal return spring.
If the brake light switch is too close to the pedal, it will not return to its original position, valve 18 (see figure 78), pressing against the body 21, will separate cavities A and B, and incomplete release of the wheels will occur when the pedal is released.
If moving the brake light switch does not eliminate the incomplete release of the brake mechanisms, you should contact a service station where they will adjust the protrusion of the adjusting bolt 4 (see figure 78) vacuum booster relative to the plane of the main cylinder flange mounting (size 1.25—0,2 mm).