GM Service Manual Online
For 1990-2009 cars
Makes 🢒 Chevrolet 🢒 2004 🢒 C-Series Medium Duty Truck C6/7/8 - Mexico 🢒 Brakes 🢒 Air Brakes 🢒 Trailer Brake Control Valve Replacement

Removal Procedure
  1. Block the wheels.
  2. Drain the air reservoirs. Refer to Draining Reservoirs .
  3. Remove the console assembly.

    4. Object Number: 227942 Size: SH
  4. Remove the air lines from the trailer air brake control valve. Refer to the following procedures:
    5. •  Hose and Line Replacement - Nylon and Metal Compression
    •  Hose and Line Replacement - Nylon Push-In Type Fitting
    •  Hose and Line Replacement - Flexible
    •  Hose and Line Replacement - Trailer and Emergency
    •  Hose and Line Replacement - Trailer Coupling
  5. Remove the following components:
    6. • The nuts
    • The washers
    • The bolts

    Object Number: 227943 Size: SH
  6. Remove the trailer air brake control valve.
  7. Inspect the air lines for the following conditions:
    8. • Damage
    • Kinks
    • Wear
  8. Replace any damaged, kinked, or worn air lines.

Installation Procedure
  1. Install the trailer air brake control valve.

    2. 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.

  2. Install the following components:
    3. • The bolts

    Tighten
    Tighten the trailer air brake control valve bolts to 40 N·m (29 lb ft).

    • The washers
    • The nuts

    Object Number: 227942 Size: SH
  3. Install the air lines to the trailer air brake control valve. Refer to the following procedures:
    4. •  Hose and Line Replacement - Nylon and Metal Compression
    •  Hose and Line Replacement - Nylon Push-In Type Fitting
    •  Hose and Line Replacement - Flexible
    •  Hose and Line Replacement - Trailer and Emergency
    •  Hose and Line Replacement - Trailer Coupling
  4. Perform the air leakage test. Refer to Trailer Brake Control Valve Operational Check .
  5. Perform the operational test. Refer to Trailer Brake Control Valve Leakage Test .
  6. Remove the wheel blocks.