Genuine Saturn Vue Brake Booster

Saturn Vue Brake Booster Parts Questions & Experts Answers

• Power Brake Booster ASSEMBLY
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  Q: How to perform an operating check and replace a power brake booster on Saturn Vue?

  A: To perform an operating check, depress the brake pedal several times with the engine off to ensure there is no change in the pedal reserve distance, then start the engine; if the pedal goes down slightly, operation is normal. For an air tightness check, start the engine and turn it off after one or two minutes, then depress the brake pedal several times slowly; if the pedal goes down farther the first time but gradually rises after the second or third depression, the booster is airtight. While the engine is running, depress the brake pedal and stop the engine with the pedal depressed; if there is no change in the pedal reserve travel after holding the pedal for 30 seconds, the booster is airtight. The power brake booster is not rebuildable and must be replaced if a problem develops. Begin by disconnecting the cable from the negative terminal of the battery, then disconnect the vacuum hose check valve from the power brake booster. Unbolt the under hood electrical center and set it aside, followed by removing the battery and the battery tray assembly. When the engine is completely cool, disconnect the hose from the coolant reservoir and the sensor wiring harness from the master cylinder. Remove the master cylinder mounting nuts, carefully pull it from its studs, and position it aside without disconnecting the brake lines. Disconnect any wiring harnesses from the booster and, for automatic trans axle-equipped models, move the trans axle control module out of the way. For ABS-equipped models, clean the areas around the ABS module fittings, disconnect the wiring from the module, and place rags under the module to catch any spilled brake fluid. Disconnect all hydraulic lines from the module, making notes of their locations to assist in assembly, and seal all openings to prevent contamination. Loosen the ABS modulator mounting nuts and pull the unit from its bracket, then remove the mounting bracket. For all models, remove the plastic cover from beneath the steering wheel, which is secured by screws and clips, and working under the instrument panel, remove the clip from the brake booster push rod. Remove the foam insulator from the brake pedal assembly, then remove the four brake booster mounting nuts. Pull the brake booster forward and toward the center of the engine compartment to remove it, ensuring to pull out the foam washer if it didn't come out with the booster. Installation is the reverse of removal; before installing the new booster, lubricate the push rod pin on the brake pedal arm with multipurpose grease, connect the push rod to the brake pedal, and install the clip. Finally, bleed the brakes and test the operation of the brakes thoroughly before placing the vehicle into normal service.