1 – check valve
Notes. To check the vacuum booster on a car, press the brake pedal 5-6 times. Then, holding the pedal down, start the engine. If you feel a downward push on the pedal, then the vacuum booster is working properly. Otherwise, check the tightness of the connection of the vacuum hose with the check valve and the engine intake pipe fitting, as well as the tightness of the check valve mount in the booster housing. If necessary, eliminate the leak. If this does not help, then the vacuum booster is faulty and must be replaced.
1. From inside the passenger compartment, remove the retaining clip from the brake pedal pin.
2. Remove the brake pedal pin, thereby disconnecting the brake booster pushrod from the pedal.
3. Disconnect the hose from the check valve and unscrew the two nuts securing the master cylinder to the vacuum booster and move it to the side, being careful not to damage the pipes.
4. Unscrew the four bracket mounting nuts and remove the bracket with the vacuum booster. Unscrew the two mounting nuts and remove the vacuum booster from the bracket.
5. Install the vacuum booster in the reverse order of removal.