GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Caution: Refer to Brake Fluid Irritant Caution in the Preface section.

Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.

  1. Remove the master cylinder. Refer to Master Cylinder Replacement .
  2. Notice: Do not overtighten vise, or damage to the master cylinder will result.

  3. Clamp the flange on the master cylinder body in a vise. Do not clamp the master cylinder body.

  4. Object Number: 176838  Size: SH
  5. Drive out the spring pins. Use a suitable punch. Do not damage the reservoir or the cylinder body when pushing out the pins.

  6. Object Number: 635742  Size: SH
  7. Remove the reservoir body (3) by pulling the body straight up and away from the cylinder body.
  8. Remove the O-rings (4) from the grooves in the reservoir.
  9. Inspect the reservoir for cracks or deformation. Replace the reservoir if necessary.
  10. Clean the reservoir. Use clean denatured alcohol.
  11. Dry the reservoir. Use non-lubricated compressed air.

Installation Procedure


    Object Number: 635742  Size: SH
  1. Lubricate the new O-rings and the reservoir-to-housing fittings. Use clean brake fluid.
  2. Insert the O-rings (4) into the grooves in the reservoir. Ensure that the O-rings are properly seated.
  3. Install the reservoir (3) to the master cylinder body. Use your hand in order to push the reservoir straight down into the body.

  4. Object Number: 176838  Size: SH
  5. Install the spring pins in order to retain the reservoir. Do not damage the reservoir or the cylinder body.
  6. Install the master cylinder. Refer to Master Cylinder Replacement .