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• Check power steering pump pressure. NOISES The hydraulic booster unit will produce certain characteristic booster noises. The noises may occur when the brake HISSING A hissing noise may be noticed when above normal brake pedal pressure is applied, 40 lbs. or above. The noise will CLUNK-CHATTER-CLICKING A clunk-chatter-clicking may be noticed when the brake pedal is released quickly, after above normal brake pedal BOOSTER FUNCTION TEST With the engine off depress the brake pedal several times to discharge the accumulator. Then depress the brake ACCUMULATOR LEAKDOWN 1. Start the engine, apply the brakes and turn the steering wheel from lock to lock. This will ensure the accumulator is charged. Turn off the engine and let the vehicle sit for one hour. After one hour there should be at least two 2. With the engine off depress the brake pedal several times to discharge the accumulator. Grasp the accumulator and see if it wobbles or turns. If it does the accumulator has lost a gas charge and the booster must be replaced. SEAL LEAKAGE If the booster leaks from any of the seals the booster • INPUT ROD SEAL (3): Fluid leakage from rear • PISTON SEAL (6): Fluid leakage from vent at • HOUSING SEAL (4): Fluid leakage between • SPOOL VALVE SEAL (7): Fluid leakage near • RETURN PORT FITTING SEAL (8): Fluid leak- 5 - 260 BRAKES - BASE - SERVICE INFORMATION DR/DH |