|
|
7. Wait a minimum of 90 seconds and try brake action again. Booster should provide two or more vacuum assisted pedal applications. If vacuum assist is not provided, booster is faulty. POWER BOOSTER VACUUM TEST 1. Connect vacuum gauge to booster check valve with short length of hose and T-fitting. 2. Start and run engine at curb idle speed for one minute. 3. Observe the vacuum supply. If vacuum supply is not adequate, repair vacuum supply. 4. Clamp hose shut between vacuum source and check valve. 5. Stop engine and observe vacuum gauge. 6. If vacuum drops more than one inch Hg (33 millibars) within 15 seconds, booster diaphragm or check valve is faulty. POWER BOOSTER CHECK VALVE TEST 1. Disconnect vacuum hose from check valve. 2. Remove check valve and valve seal from booster. 3. Use a hand operated vacuum pump for test. 4. Apply 15-20 inches vacuum at large end of check valve. 5. Vacuum should hold steady. If gauge on pump indi- cates vacuum loss, check valve is faulty and REMOVAL LEFT HAND DRIVE (LHD) 1. Disconnect the wire to the fluid level switch at the bottom of the reservoir. 2. Remove the master cylinder (Refer to 5 - BRAKES/ HYDRAULIC/MECHANICAL/MASTER CYLINDER - 3. Disconnect vacuum hoses from booster check valve. 4. Remove the brake lines from the master cylinder and the HCU (abs vehicles only) or the junction 5. Disconnect the HCU from the mounts and move to the side for clearance of the booster. 6. Remove knee blocker under the steering column, (Refer to 23 - BODY/INSTRUMENT PANEL/KNEE BLOCKER - REMOVAL). 5 - 32 BRAKES - BASE - SERVICE INFORMATION KJ |