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Power Brake Booster: Disassembly

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  1. 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.
    Fig 1: Exploded View Of Bendix Hydro-Boost Power Brake Booster
    G31269Courtesy of GENERAL MOTORS CORP.
    Fig 2: Compressing Accumulator
    G91J13515Courtesy of GENERAL MOTORS CORP.
  2. Insert punch into hole in housing. Release clamp and remove accumulator piston compressor. Remove accumulator and "O" ring. Remove retainer, spool plug, "O" ring and spool return spring from spool plug bore.
  3. Remove baffle, output pushrod, 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.
  4. 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.
Fig 3: Removing Accumulator Valve Using Fabricated Tool
G91A13516Courtesy of GENERAL MOTORS CORP.
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