GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Air Brake Double Check Valve Replacement

Removal Procedure
  1. Apply the parking brake.
  2. Block the wheels.
  3. Drain all the reservoirs. Refer to Draining Reservoirs .
  4. Disconnect the air lines from the valve.

    5. Object Number: 202535 Size: SH
  5. Remove the double check valve (3) from the application valve (4).

Installation Procedure

    Object Number: 202535 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.

  1. Connect the valve (3) to the application valve  (4).

    2. Tighten
    Tighten the double check valve (3) to 28 N·m (21 lb ft).

  2. Install the air lines.
  3. Start the engine.
  4. Charge the system air pressure to the governor cut-out point.
  5. Stop the engine.
  6. Check for air leaks using a soap solution. Refer to Air Brake System Leak Test .
  7. Remove the wheel blocks.