GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 Cutlass 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Master Cylinder Reservoir Replacement

Removal Procedure
  1. Remove the master cylinder. Refer to Master Cylinder Replacement .

    2. Notice: Do not clamp on master cylinder body. Doing so may damage the master cylinder.

  2. Clamp the flange of the master cylinder body in a vise.

    3. Object Number: 175186 Size: SH
  3. Drive the spring pins (2) free with a suitable 1/8 inch punch (4).

    4. Do not damage the reservoir (1) or the cylinder body (3) when driving out the spring pins.

  4. Remove the master cylinder reservoir by pulling straight up and away from the master cylinder body.

    5. Object Number: 481544 Size: MH
  5. Remove the reservoir-to-body O-rings (4) from the grooves in the master cylinder reservoir (3).
  6. Dispose of the O-rings (4).

Installation Procedure

    Object Number: 481544 Size: MH
  1. Lubricate the new reservoir-to-body O-rings (4) and the reservoir flanges with clean brake fluid.
  2. Install the reservoir-to-body O-rings (4) into the grooves in the master cylinder reservoir (3).

    3. Ensure that the O-rings are properly seated.


    Object Number: 236824 Size: SH
  3. Install the master cylinder reservoir (3) to the master cylinder body (2) by pressing straight down.

    4. Object Number: 175186 Size: SH
  4. Install the spring pins (2) by driving the pins in with a 1/8 inch punch (4). Do not damage the reservoir (1) or the master cylinder body (3).
  5. Install the master cylinder. Refer to Master Cylinder Replacement .
  6. Fill the master cylinder to the proper level with clean brake fluid. Refer to Master Cylinder Reservoir Filling .
  7. Bleed the brake system. Refer to Hydraulic Brake System Bleeding .