OEM Buick Rendezvous Brake Booster

Buick Rendezvous Brake Booster Parts and Q&A

• Brake Booster
  18045787
  Q: How to replace the Vacuum Brake Booster on a 3.5L engine on Buick Rendezvous?

  A:

  Before working on the vacuum Brake Booster you must first relieve fuel line pressure and drain the cooling system on a 3.5l engine. Take off all parts including the Coolant Reservoir, left front belt frame, and powertrain control module housing from the air filter location. Place the pcm aside instead of unplugging its electrical wires and take out the air cleaner plus its duct system. Disconnect fuel lines both behind and within the vapor tube according to metal and plastic connector protocols. Unplug the heater hose from the coolant crosspassage and move it aside to obtain access to brake pipes. Detach fuel lines from the shock tower to reach brake pipes and disconnect the fluid level sensor switch from the Brake Master Cylinder. Take off the master cylinder and abs module after disconnecting the Brake Lines that attach to it. Disconnect the vacuum hose from the valve of the vacuum Brake Booster and put it aside before disassembling the knee bolster. Disconnect the booster push pin parts with its washer from Brake Pedal assembly before pulling out the Brake Booster pushrod. Use a wrench to take off Brake Booster mounting nuts then disconnect the two front Engine Mounts along with their nuts and bolts. Move the engine forward to get to the Brake Booster for uninstallation. Mount the Brake Booster onto the cowl and mounting plate before fastening the Brake Booster assembly nuts to 25 nm (18 ft. Lbs. Torque). First place the master cylinder into position while setting the Brake Booster push rod to the Brake Pedal and maintaining it with both pieces of hardware. Set the stoplamp switch to block brake dragging and lessen parts wear before putting in the knee bolster. Replace the engine back into position and fasten engine mounts with their bolts and nuts. Place the vacuum Brake Booster check valve hose on first, then set the abs module bracket and module together with the Brake Master Cylinder and brake lines. Wire the fluid level sensor on the master cylinder and attach fuel lines to their mounting positions on the shock tower. Also replace the heater hose connector to the coolant crossover pipe. Afterward place back the components in their original positions including the engine compartment air filter assembly and ductwork while reinstalling the pcm housing unit. Fully charge the cooling system and perform brake pressure release to finish the procedure.