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Master Cylinder/Brake Booster Brake Booster Inspection Functional Test 1. With the engine stopped, press the brake pedal sev- eral times to deplete the vacuum reservoir, then press the pedal hard and hold it for 15 seconds. If the pedal sinks, either the master cylinder is bypassing internally, or the brake system (master 2. Start the engine with the pedal pressed. If the pedal sinks slightly, the vacuum booster is operating nor- mally. If the pedal height does not vary, the booster or check valve is faulty. 3. With the engine running, press the brake pedal light- ly. Apply just enough pressure to hold back auto- cylinder is faulty. A slight change in pedal height mal. (The A/C compressor load changes the vacuum available to the booster.) Leak Test 1. Press the brake pedal with the engine running, then stop the engine. If the pedal height does not vary 2. With the engine stopped, press the brake pedal sev- eral times using normal pressure. When the pedal is pedal position does not vary, check the booster check valve. Booster Check Valve Test 1. Disconnect the brake booster vacuum hose at the booster. 2. Start the engine, and let it idle. There should be vac- uum. If no vacuum is available, the check valve is NOTE: '96 - 97 models shown. BRAKE BOOSTER VACUUM HOSE (Check valve is Main Menu Table of Contents |