GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

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

  2. Object Number: 165396  Size: SH

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

  3. Clamp the flange of the master cylinder body (3) in a vise.

  4. Object Number: 165371  Size: MH
  5. Drive out the spring pins (13) using a 1/8 inch punch.
  6. Do not damage the reservoir (3) or the cylinder body (5) when driving out the spring pins (13).

  7. Remove the master cylinder reservoir (3).
  8. Pull the master cylinder reservoir (3) straight up and away from the master cylinder body (5).

    Remove the reservoir (3) from the body (5).

  9. Remove the O-rings (4) from the grooves on the master cylinder reservoir (3). Discard the O-rings.
  10. Clean the reservoir (3) with clean denatured alcohol.
  11. Dry the reservoir (3) with non-lubricated compressed air.
  12. Inspect the master cylinder reservoir (3) for cracks or deformation. Replace the reservoir (3) if damage is evident.

Installation Procedure

Caution: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:

   • Eye contact--rinse thoroughly with water.
   • Skin contact--wash with soap and water.
   • If ingested--consult a physician immediately.

Notice: Avoid spilling brake fluid on any of the vehicle's painted surfaces, wiring, cables or electrical connectors. Brake fluid will damage paint and electrical connections. If any fluid is spilled on the vehicle, immediately flush the area with water to minimize the potential for damage.


    Object Number: 165371  Size: MH
  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 (4) into the grooves on the master cylinder reservoir (3).

  4. Object Number: 165371  Size: MH
  5. Ensure that the O-rings (4) are properly seated.

  6. Object Number: 165404  Size: SH
  7. Install the master cylinder reservoir (3) to the master cylinder body (2). Press straight down by hand into the master cylinder body (2).

  8. Object Number: 165396  Size: SH
  9. Install the spring pins (2, 4) using a 1/8 inch punch (4).
  10. Do not damage the reservoir (1) or the master cylinder body (3).

  11. Install the master cylinder.