Avalanche 1500 2WD V8-5.3L (2008)
Hydraulic Fluid Accumulator: Service and Repair
Hydraulic Brake Booster Accumulator Replacement
Tools Required
J 26889 Accumulator Piston Compressor
Removal Procedure
Caution: The accumulator contains compressed gas. Always use the proper tools and follow the recommended procedures or personal injury may result.
Do not apply heat to accumulator. Do not attempt to repair an inoperative accumulator. Always replace an inoperative accumulator with a new one.
Dispose of an inoperative accumulator by drilling a 1.5 mm (1/16 in) diameter hole through the end of the accumulator can, opposite the O-ring.
Caution: Push rod removal is not recommended. Improper staking of the push rod to the Hydroboost reaction piston can result in a loss of brakes. If the
rod or seals require service, the entire unit must be replaced.
1. Apply the park brake and block the wheels.
2. Depress brake pedal at least 10 times in order to relieve pressure in the accumulator.
3. Remove the master cylinder from the hydraulic booster. Refer toMaster Cylinder Replacement (JD9) (See: Hydraulic System/Brake Master
Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement (JD9))Master Cylinder Replacement (JH6) (See: Hydraulic
System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement (JH6))Master Cylinder Replacement
(J92) (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Replacement (J92)) .
4. Place the J 26889 over the end of the accumulator.
5. Install the nut on the stud.
6. Depress the accumulator with a C-clamp. If the accumulator does not move with moderate pressure, remove the C-clamp and depress the brake
pedal ten times in order to relieve pressure in the accumulator.
