Brake Booster: Reassembly

1992 Chevrolet Cavalier RS, 2D Convertible, 3.1 T, StandardSECTION Reassembly
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1991 Pontiac Grand Prix, 1991 Oldsmobile Cutlass Supreme, 1991 Chevrolet Lumina, 1991 Buick Regal, and 1990 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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.
  2. 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.
    Fig 1: Exploded View of Delco-Moraine Tandem Diaphragm Booster
    G200075
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.