OEM 2007 Buick LaCrosse Brake Booster

2007 Buick LaCrosse Brake Booster Parts and Q&A

• Q: How to replace the Vacuum Brake Booster (LY7) on 2007 Buick LaCrosse?

  A: Begin the vacuum Brake Booster replacement by obtaining a power Brake Booster holder named j 22805-b. Unplug the battery first and take out the left instrument panel insulator. Pull the brake apply sensor bas out of the Brake Booster and remove the related retaining clip to detach the pushrod from the Brake Pedal. Take out the exhaust crossover part plus detach the Brake Fluid Level Sensor electric contacts. You must first remove the bpmv bracket and screws, then both master cylinder mounting nuts to free the master cylinder. Position it aside without disconnecting the brake lines. Separate the vacuum Brake Booster check valve and empty the coolant system before disconnecting the thermostat heater pipes from the engine. Use the master cylinder retaining nuts to connect the power Brake Booster holder (J 22805-B) to the booster before unlocking and turning the booster counterclockwise away from the cowl. Twist the new vacuum Brake Booster clockwise into the cowl position until the locking tab engages when you use an ratchet tool with the power Brake Booster holder (J 22805-B). Take out the holder and place the heater pipes before attaching the vacuum hose with its check valve assembly. Place both parts together and bolt them at 33 n.m (24 lb ft). Reattach bpmv hardware and framework before joining fluid level sensor electric wires. Finally install the exhaust crossover pipe. Add cooled fluid to the system while placing the Brake Booster pushrod onto the Brake Pedal after securing the retaining clip then reconnecting power.