Brake booster — removal, installation and adjustment

1. The brake booster assembly does not require special maintenance between periodic inspections of the vacuum hoses and housing.

2. The brake booster cannot be repaired If a problem occurs, replace it.

Withdrawal

3. Unscrew the nuts securing the brake master cylinder to the booster and carefully slide the master cylinder forward until the support studs are visible. Be careful not to bend or twist the brake pipes (see picture).



4. Disconnect a vacuum hose in the place of its fastening to the brake booster.

5. Working inside the cabin under the steering column, disconnect the brake light switch electrical connector, then remove the push rod retainer clip and nylon washer from the brake pedal stud. Remove the push rod from the stud (see figure 17.2).

6. Also unscrew the nuts securing the brake booster to the fire barrier.

7. Carefully disconnect the booster from the firewall and remove it from the engine compartment.

Installation

8. Place the booster in place on the firewall and tighten the support nuts. Connect the bar and brake light switch to the brake pedal. Install the retaining clip onto the pedal stud.


9. Connect to the amplifier the main brake cylinder. Tighten the nuts to the required tightening torque.

10. Carefully check the operation of the brake system before leaving on the road.

Adjustment

11. Some amplifiers feature an adjustable stem. They are connected to the amplifier at the factory and usually do not require adjustment, but if you have suspicions, you can make a probe from a sheet of metal (see picture).



12. A number of common symptoms of an unadjusted rod - vibration of the brake (rod is too long), too much brake pedal travel, accompanied by a roaring sound from the amplifier (rod is too short).

13. To check the rod length, unscrew the master cylinder from the booster and mark it on the side. It is not necessary to disconnect the hydraulic lines, but it is important not to bend them.

14. Block the front wheels, set the parking brake, put the transmission in the position "parking" or "neutral".

15. Start the engine and install the rod probe against its end, so that the rod enters the amplifier housing, a force of approximately 2.3 kg must be applied. (5 pounds) (see drawing). The rod length must be between the minimum and maximum marks on the dipstick. Otherwise, adjust its length by holding the knurled part with pliers and turning the end with a wrench.




16. At the end of the adjustment, reinstall the master cylinder and check the operation of the brakes.