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Removal Procedure

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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 (Vacuum Boost)  or Master Cylinder Replacement (Hydraulic Boost) .
  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 1: View Of Accumulator With C-Clamp
    GM361397Courtesy 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 (2) with a small tool inserted into the access hole (1).
    9. Fig 2: Identifying Brake Booster Retaining Ring & Access Hole
    GM360991Courtesy of GENERAL MOTORS CORP.
  9. Remove the accumulator retainer ring (1) using a small hook shaped tool.
    10. Fig 3: Identifying Accumulator Components
    GM361385Courtesy of GENERAL MOTORS CORP.
    Fig 4: View Of 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: Identifying Accumulator Components
    GM361385Courtesy of GENERAL MOTORS CORP.
  13. Remove the accumulator (2) and the O-ring seal (3).
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