GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2000 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Brakes 🢒 Air Brakes 🢒 Air Brake Double Check Valve Replacement

Removal Procedure
  1. Block the wheels.
  2. Tilt the cab. Refer to Cab Tilting in General Information.
  3. Drain all of the air reservoirs. Refer to Draining Reservoirs .
  4. Remove the upper inner fender panel.
  5. Remove the air lines from the double check valve. Refer to the following procedures:
    6. •  Hose and Line Replacement - Nylon and Metal Compression
    •  Hose and Line Replacement - Nylon Push-In Type Fitting
    •  Hose and Line Replacement - Flexible

    Object Number: 227905 Size: SH
  6. Remove the double check valve from the dual application valve.
  7. Inspect the air lines for the following:
    8. • Damage
    • Kinks
    • Wear
  8. Repair or replace the air lines as necessary.

Installation Procedure

    Object Number: 227905 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. Install the double check valve to the dual application valve.

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

  2. Install the air lines to the double check valve.
  3. Perform the air leakage test. Refer to Air Brake Double Check Valve Leakage Test .
  4. Perform the operational test. Refer to Air Brake Double Check Valve Operational Check .
  5. Install the upper inner fender panel.
  6. Lower the cab.
  7. Remove the wheel blocks.