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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 333 (Hydraulic Brake System) >> Repair Instructions >> Power Brake Booster Pump Fluid Accumulator Replacement (JH6) >> Removal Procedure

Removal Procedure

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WARNING:

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.

WARNING:

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 to Master Cylinder Replacement (JD9) , Master Cylinder Replacement (JH6) , Master Cylinder Replacement (Two-mode Hybrid) .
    4. Fig 1: Accumulator With C-Clamp
    GM361397Courtesy of GENERAL MOTORS CORP.
  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.
    7. Fig 2: Brake Booster Retaining Ring And Access Hole
    GM360991Courtesy of GENERAL MOTORS CORP.
  7. Rotate the retaining ring (2) until either end of the ring is under the access hole (1).
  8. Depress and hold the retaining ring with a small tool inserted into the access hole (1).
    9. Fig 3: Accumulator Components
    GM361385Courtesy of GENERAL MOTORS CORP.
  9. Remove the accumulator retainer ring (1) using a small hook shaped tool.
    10. Fig 4: Accumulator With C-Clamp
    GM361397Courtesy of GENERAL MOTORS CORP.
  10. Release the C-clamp.
  11. Remove the nut from the stud.
  12. Remove the J 26889 .
    13. Fig 5: Accumulator Components
    GM361385Courtesy of GENERAL MOTORS CORP.
  13. Remove the accumulator (2) and the O-ring seal (3).
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