Power Brake Booster: Disassembly
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sierra, 1999 GMC Savana Special, and 1999 GMC Savana Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
- Install Accumulator Piston Compressor (J-26889) on master cylinder mounting stud and retain with nut. See Fig 1 and Fig 2 . Compress accumulator using "C" clamp. If the accumulator does not move with moderate pressure, take the "C" clamp off, and pump the brake pedal about 10 times. This will relieve the pressure in the accumulator, and allow removal with the "C": clamp as stated above
- Rotate retaining ring until either end can be seen through the hole in the housing. Insert punch into hole to compress ring. Release clamp and remove accumulator piston compressor. Remove accumulator and "O" ring. Remove retainer using a small hook shaped tool, then spool plug, "O" ring and spool return spring from spool plug bore.
- Remove baffle, output push rod, spring and baffle retainer, piston return spring and spring retainer. Saw off eyelet on pedal rod. Remove pedal rod boot, bracket nut and bracket. Remove housing cover bolts. Separate cover from housing.
- Remove seal from end of rod on piston assembly. Remove housing seal. Remove piston assembly and piston seal. Remove spool valve. Remove accumulator valve using wire hook. See Fig 3. Remove return port fitting and "O" ring.
WARNING:
DO NOT attempt to repair or apply heat to accumulator. Before discarding defective accumulator, drill a 1/16" hole through end of accumulator can at end opposite of "O" ring.
CAUTION:
Push rod removal is not recommended. Improper staking of push rod to piston can result in loss of brakes. If rod or seals require service, replace complete unit.