GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 570457  Size: SH
  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.

  3. Clamp the flange of the master cylinder body in a vise.
  4. Drive out the spring pins (2) using a 1/8 inch punch (4).
  5. Do not damage the reservoir or the cylinder body.

  6. Remove the master cylinder reservoir (1) by pulling straight up and away from the master cylinder body.

  7. Object Number: 570469  Size: SH
  8. Remove the O-rings (4) from the grooves on the master cylinder reservoir (3). Discard the O-rings.

Installation Procedure


    Object Number: 570469  Size: SH
  1. Lubricate the new O-rings (4) with clean brake fluid.
  2. Lubricate the reservoir flanges with clean brake fluid.
  3. Install the new O-rings into the grooves on the master cylinder reservoir.
  4. Ensure that the O-rings are properly seated.


    Object Number: 570510  Size: SH
  5. Install the master cylinder reservoir (3) by pressing the reservoir by hand straight down into the master cylinder body.

  6. Object Number: 570457  Size: SH
  7. Install the spring pins (2) using a 1/8 inch punch (4).
  8. Do not damage the reservoir (1) or the master cylinder body (3).

  9. Install the master cylinder. Refer to Master Cylinder Replacement .