GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 161631  Size: SH
  1. Remove the master cylinder. Refer to Master Cylinder Replacement .
  2. Important: Do not clamp on the master cylinder body.

  3. Clamp the flange on the master cylinder body in a vise

  4. Object Number: 161642  Size: SH
  5. Drive out the spring pins using a 1/8 inch punch.
  6. Important: Do not damage the reservoir or the cylinder body when driving out the pins.

  7. Remove the reservoir by pulling straight up and away from the cylinder body.
  8. Remove the o-rings from the grooves in the reservoir.
  9. Inspect the reservoir for cracks or deformation. Replace if damage is found.
  10. Clean the reservoir with clean denatured alcohol.
  11. Dry the reservoir with unlubricated compressed air.

Installation Procedure

    Important: Lubricate the new o-rings and reservoir bayonets with clean brake fluid.

  1. Install the o-rings into the grooves in the reservoir.
  2. The o-rings must be properly seated.

  3. Object Number: 161643  Size: SH
  4. Install the reservoir to the master cylinder body by pressing straight down by hand into the body.

  5. Object Number: 161642  Size: SH
  6. Drive in the spring pins to retain the reservoir using care not to damage the reservoir or the cylinder body.

  7. Object Number: 161629  Size: SH
  8. Install the master cylinder. Refer to Master Cylinder Replacement .