GM Service Manual Online
For 1990-2009 cars only

Tools Required

CH-47830 Holding Fixture

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

Removal Procedure


    Object Number: 1977780  Size: SH
  1. Using a suitable tool, remove the brake fluid from the master cylinder reservoir.
  2. Discard the brake fluid into an approved container.

  3. Remove the brake master cylinder and power brake booster assembly. Refer to Brake Master Cylinder with Power Brake Booster and Chassis Control Module Replacement .
  4. Install the CH-47830  (1)  to the master cylinder assembly.
  5. Position the CH-47830 with the master cylinder assembly in a vise.

  6. Object Number: 1977781  Size: SH
  7. Release the brake fluid level sensor electrical connector (1) from the sensor bracket.

  8. Object Number: 1977782  Size: SH
  9. Remove the master cylinder reservoir roll pin (1).

  10. Object Number: 1977783  Size: SH
  11. Remove the master cylinder reservoir bolt (1).

  12. Object Number: 1977784  Size: SH
  13. Release the power brake booster inlet hose clamp (1), disconnect the hose and remove the master cylinder reservoir (2).
  14. Remove the 2 master cylinder reservoir grommets from the master cylinder, if necessary.

Installation Procedure


    Object Number: 1977784  Size: SH
  1. Install the 2 master cylinder reservoir grommets to the master cylinder, if removed.
  2. Important: Apply a small amount of clean brake fluid from a sealed container to the master cylinder reservoir grommets prior to installing the reservoir.

  3. Release the power brake booster inlet hose clamp (1), connect the hose and install the master cylinder reservoir (2).
  4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1977783  Size: SH
  5. Install the master cylinder reservoir bolt (1).
  6. Tighten
    Tighten the bolt to 2 N·m (18 lb in).


    Object Number: 1977782  Size: SH
  7. Install the master cylinder reservoir roll pin (1).

  8. Object Number: 1977781  Size: SH
  9. Install the brake fluid level sensor electrical connector (1) to the sensor bracket.

  10. Object Number: 1977780  Size: SH
  11. Remove the CH-47830  (1)  from the master cylinder assembly.
  12. Install the brake master cylinder and power brake booster assembly. Refer to Brake Master Cylinder with Power Brake Booster and Chassis Control Module Replacement .
  13. Fill the brake master cylinder reservoir. Refer to Master Cylinder Reservoir Filling .