Master Cylinder: Assembly
- Clean the interior and exterior of the master cylinder, the secondary piston (1), and the return spring in denatured alcohol, or equivalent. See Fig 1
.
- Inspect the master cylinder bore, inlet and outlet ports, the secondary piston (1), and the return spring for cracks, scoring, pitting, and/or corrosion. Replace the master cylinder if any of these conditions exist. See Fig 1
.
- Dry the master cylinder and the individual components with non-lubricated, filtered air.
- Lubricate the master cylinder bore, the secondary piston (1), the return spring, and all of the individual overhaul components with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. See Fig 1
.
- Assemble the lubricated, new primary seal (6) and retainer, and new secondary seal (5) onto the secondary piston. See Fig 1
.
- Install the lubricated return spring and secondary piston assembly (1) into the cylinder bore. See Fig 1
.
- Install the lubricated, new primary piston assembly (2) into the cylinder bore. See Fig 1
.
- Using a smooth, round-ended tool, depress the primary piston (2) and install the new piston retainer. See Fig 1
.
- Install the master cylinder reservoir to the master cylinder. See MASTER CYLINDER RESERVOIR
under REMOVAL & INSTALLATION.
- Install the reservoir cap and diaphragm to the reservoir.
- Install the master cylinder to the vehicle. See MASTER CYLINDER
under REMOVAL & INSTALLATION.
Courtesy of GENERAL MOTORS CORP.