GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Notice: Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush the area with water. If any brake fluid comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away the fluid.


    Object Number: 601760  Size: SH
  1. Apply the parking brake and block the wheels.
  2. Disconnect the brake pipes from the master cylinder.
  3. Important: Install a rubber cap or plug to the exposed brake pipe fitting ends in order to prevent brake fluid loss and contamination.

  4. Plug the open brake pipe ends.

  5. Object Number: 601809  Size: SH
  6. Remove the master cylinder nuts and bolts.
  7. Remove the combination valve bracket.
  8. Remove the master cylinder from the vehicle.
  9. Drain the master cylinder of all brake fluid.

Installation Procedure


    Object Number: 601809  Size: SH
  1. Bench bleed the master cylinder. Refer to Master Cylinder Bench Bleeding .
  2. Install the master cylinder to the vehicle.
  3. Install the combination valve bracket.
  4. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  5. Install the master cylinder bolts and nuts.
  6. Tighten
    Tighten the nuts to 36 N·m (27 lb ft).


    Object Number: 601760  Size: SH
  7. Connect the brake pipes to the master cylinder.
  8. Tighten
    Tighten the pipe nuts to 30 N·m (22 lb ft).

  9. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding .