GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: Note the identification code on the combination valve. The new valve must have the same identification number as the old valve.

  1. Remove the Master Cylinder. Refer to Master Cylinder Replacement .
  2. Remove the combination valve electrical connector.

  3. Object Number: 596405  Size: SH
  4. Remove the front and the rear brake pipes.
  5. Remove the combination valve from the vehicle.

Installation Procedure

Important: Verify that the replacement combination valve has the same pin punched identification code as the code on the old combination valve.

  1. Install the combination valve to the vehicle.

  2. Object Number: 596405  Size: SH

    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.

  3. Install the front and the rear brake pipes to the combination valve.
  4. Tighten
    Tighten the brake pipe nuts to 30 N·m (22 lb ft).

  5. Connect the combination valve electrical connector.
  6. Install the Master Cylinder. Refer to Master Cylinder Replacement
  7. Important: Verify that the combination valve metering rod is depressed during bleeding.

  8. Bleed the brake system. Refer to Hydraulic Brake System Bleeding .