Installation Procedure

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Internal components of this booster are not serviceable. The housing must not be unstaked and separated. Separating the housing will cause permanent deformation, preventing the booster from holding proper volume.

NOTE: Inspect the locking flanges on booster and mounting plate. Replace the booster and mounting plate if the locking flanges are bent or damaged.

Reinstall the coolant heater pipes.
Reposition and connect the vacuum hose and check valve assembly to the booster.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Reposition the master cylinder onto the booster and install the master cylinder retaining nuts.
Tighten: Tighten the master cylinder retaining nuts to 33 N.m (24 lb ft).
Reinstall the ABS module bracket and fasteners.
Tighten: Tighten the ABS module bracket nuts to 10 N.m (7 lb ft).
Connect the brake fluid level sensor electrical connector to the brake fluid level sensor.
Reinstall the exhaust system crossover pipe. Refer to Exhaust Crossover Pipe Replacement (RPOs L26/L32) or Exhaust Crossover Pipe Replacement (RPO LY7) .
Refill the cooling system. Refer to Draining and Filling Cooling System (LY7) or Draining and Filling Cooling System (L26) .
Connect the brake booster pushrod to the brake pedal and install the retaining clip.
Reinstall the BAS.
Tighten: Tighten the BAS bolt to 2.5 N.m (22 lb in).
Install the left instrument panel insulator.
Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.