GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Brakes 🢒 Air Brakes 🢒 Pressure Protection Valve Replacement

Removal Procedure

    Object Number: 227926 Size: SH
  1. Block the wheels.
  2. Drain all the air reservoirs. Refer to Draining Reservoirs .
  3. Remove the air line from the pressure protection valve. Refer to the following procedures:
    4. • Hose and Line Replacement - Nylon Push-In Type Fitting
    • Hose and Line Replacement - Flexible
    • Hose and Line Replacement - Trailer and Emergency
  4. Remove the pressure protection valve.

Installation Procedure

    Object Number: 227926 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 pressure protection valve.

    2. Tighten
    Tighten the pressure protection valve to 30 N·m (22 lb ft).

  2. Install the air line to the pressure protection valve.
  3. Perform the air leakage test. Refer to Pressure Protection Valve Leakage Test .
  4. Perform the operational test. Refer to Pressure Protection Valve Operational Check .
  5. Remove the wheel blocks.