Attention! Before replacing the vacuum booster, it is necessary to replace the check valve of the vacuum line, because the membrane in the brake booster may be damaged by the penetrated fuel vapors or there is a defect in the check valve itself. When installing, the "Arrow" on the check valve should be directed towards the intake manifold.
After completing the work, bleed the brake system.
The design of the vacuum brake booster is shown in Figure 11.51.
The brake booster must be replaced in the following order: Remove the windshield wiper arm bracket, the brake master cylinder, the left lower instrument panel trim, and the pedal mechanism trim.
Disconnect the brake booster from the brake pedal and from the engine compartment bulkhead. Loosen the bolts (arrows, Fig. 11.52) and remove the siren with autonomous power supply together with the holder. Press and disconnect the lever mechanism from the windshield wiper electric drive. Move the lever mechanism to the side.
Detach the fairing and move it upward. Carefully remove the brake booster (arrow, Fig. 11.53) from the front shield and, tilting it towards the engine, remove it with an upward movement.
The installation of the booster should be carried out in the reverse order, while it is necessary to replace the self-locking nuts securing the pedal bracket and brake booster to the engine compartment bulkhead and tighten them to a torque of 31 N·m (3.1 kgf·m). Bleed the brake system.