Brake Booster: Reassembly
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1990 Pontiac Bonneville, 1990 Oldsmobile Ninety-Eight, 1990 Oldsmobile Eighty-Eight, 1990 Cadillac Fleetwood, and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
- Place power piston on bench with push rod end up. Install Assembly Cone (J-28458) over push rod end of piston. Lubricate inside diameter of secondary diaphragm with silicon lubricant and fit in secondary support plate.
- Install secondary diaphragm and support plate over power piston and push down until it bottoms. Lubricate inside diameter of secondary power piston bearing. Install bearing in housing divider with flat surface of bearing on the same side as 6 raised lugs on divider.
- Hold divider so that formed flange faces up. Press divider down over assembly cone and onto power piston to rest against secondary diaphragm. Lubricate inside diameter of primary diaphragm and install in primary support plate. Remove assembly cone from power piston, place primary support plate and diaphragm assembly over power piston and push down until it bottoms.
- Place diaphragm retainer over power piston and onto diaphragm. Install Assembly Cone (J-28458) over power piston onto diaphragm retainer and strike with hammer until retainer is locked on neck of power piston. Remove assembly cone.
- Install reaction retainer, piston rod and power head silencer. Place primary power piston bearing in rear housing center hole. Lubricate with silicone lubricant on inner diameter. Install rear housing on Adapter (J-35883) and Fixture (J-23456). Attach power piston assembly to rear housing.
- Install power piston return spring over reaction retainer. Install front housing and align scribe marks. Tighten fixture handscrew just enough to allow for housing rotation. Rotate housing until tabs are fully seated. Stake 2 housing tabs into sockets at 2 new locations 180° apart. Do not stake tabs that have previously been staked.
- Lubricate inside and outside diameters of grommet and front housing seal. Install seal, grommet, vacuum check valve, silencer and push rod boot.