GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2002 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Air Brakes 🢒 Rear Air Brake Relay Valve Replacement

Removal Procedure

    Object Number: 227932 Size: SH
  1. Block the wheels.
  2. Drain all of the air reservoirs. Refer to Draining Reservoirs .

    3. Important: Tag or label the air lines for installation.

  3. Remove the air lines from the relay 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
  4. Remove the nuts, the washers, and the bolts.
  5. Remove the relay valve.
  6. Inspect the air lines for the following:
    7. • Damage
    • Kinks
    • Wear
  7. Repair or replace the air lines as necessary.

Installation Procedure

    Object Number: 227935 Size: SH
  1. Install the relay valve to the bracket.

    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 bolts, the washers, and the nuts.

    3. Tighten
    Tighten the relay valve bolts to 52 N·m (38 lb ft).

  3. Install the air lines to the relay valve.
  4. Perform the air leakage test. Refer to Rear Air Brake Relay Valve Leakage Test .
  5. Perform the operational test. Refer to Rear Air Brake Relay Valve Operational Check .
  6. Remove the wheel blocks.