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VACUUM LEAK TEST 1. Disconnect the vacuum hose at the vacuum check and tee-in a vacuum gauge. 2. Start the engine. 3. Allow the engine to warm up to normal operating temperature and engine idle. 4. Using vacuum line pliers, close off the vacuum supply hose near the booster and observe the vacuum gauge. If the vacuum drop exceeds 1.0 inch Hg (3.3 kPa) in one minute, repeat the above steps to confirm the reading. 5. Remove the pliers from the hose temporarily. 6. Apply light effort (approximately 15 lbs. of force) to the brake pedal and hold the pedal steady. Do not move the pedal once the pressure is applied or the test results may vary. 7. Have an assistant reattach the pliers to the vacuum supply hose. 8. Allow 5 seconds for stabilization, then observe the vacuum gauge. If the vacuum drop exceeds 3.0 inches Hg (10 kPa) in 15 seconds, repeat the above steps to confirm the reading. REMOVAL NOTE: Before proceeding, (Refer to 5 - BRAKES - WARNING) (Refer to 5 - BRAKES - CAUTION). 1. Disconnect and isolate the battery negative cable from its post on the battery. 2. Remove the master cylinder. (Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/MASTER CYLINDER - REMOVAL) 3. Disconnect the vacuum hose (2) from the check valve (1) on the power brake booster. Do do not 4. If equipped, remove the silencer pad below the steering column opening cover. 5. Remove the steering column opening cover on the instrument panel. (Refer to 23 - BODY/INSTRUMENT PAN- EL/STEERING COLUMN OPENING COVER - REMOVAL) 6. Remove the reinforcement behind the steering column opening cover. PM BRAKES - BASE 5 - 77 |