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Brake Booster - DELCO Hydro-Boost: Reassembly

  1. Position piston bracket into yoke of lever and install new pin through hole. Use a punch to mushroom end of pin. Make sure lever is free to move with no binding.
  2. Install new seal in rear housing groove and new power piston seal in front housing. Insert spool valve spring and spool valve assembly into bore of front housing.
  3. Pull up on power piston and extend lever to accept sleeve on spool valve. While holding lever extended, bring front housing with spool valve directly over rear housing and slide lever pins into slot in sleeve.
  4. To install rear housing to front housing center power piston/accumulator in bore. Before housings contact, install seal protector through piston bore until seated on piston. Push housings together and remove seal protector. Tighten Torx bolts to 20 ft. lbs. (27 N.m).
  5. Install output rod, spring and a new spring retainer. Using a 7/8" deep socket, secure new output rod retainer in place.
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