Answer
Jun 27, 2025 - 10:26 AM
To test a GM power brake booster, start by turning off the engine and pressing the brake pedal multiple times to deplete any residual vacuum. Then, hold the pedal down and start the engine; if the booster is functioning correctly, the pedal should move slightly downward as the engine vacuum assists. Additionally, you can check for vacuum leaks by listening for hissing sounds and inspecting hoses and connections for damage.
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