Installation Procedure

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 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.

Install the vacuum brake booster.
Position the vacuum brake booster on the cowl counterclockwise from the final installation position so that the locking flanges on the vacuum brake booster and on the cowl mounting flange engage.

IMPORTANT: Ensure that the locking tab and the flanges are in the fully engaged position.

Fig 1: Locking/Unlocking Booster To Cowl

Courtesy of GENERAL MOTORS CORP.

Turn the vacuum brake booster clockwise with a ratchet on the J 22805-B (2). See Special Tools . DO NOT use a flat bladed tool in the locking tab to install the vacuum brake booster. When the vacuum brake booster is correctly installed, the locking tab (1) slides up the flange and engages the locking notch.
Remove the J 22805-B (2) from the installed vacuum brake booster. See Special Tools .
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 .
Refill the cooling system. Refer to Draining and Filling Cooling System (L26 Static Fill) , Draining and Filling Cooling System (LY7 Static Fill) or Draining and Filling Cooling System (L26, LY7, GE 47716 Fill) .
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 (L26) or Battery Negative Cable Disconnect/Connect Procedure (LY7) in Engine Electrical.