GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2001 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Air Brakes 🢒 Rear Air Brake Relay Valve Operational Check
  1. Block the wheels.
  2. Start the engine.
  3. Charge the system air pressure to the governor cut-out point.
  4. Have an assistant apply the brakes hard and then release them several times.

    5. Object Number: 202648 Size: SH
  5. Check that the brakes apply and release promptly at each wheel.
  6. Repair or replace the valve (5) if the brakes do not release promptly.
  7. Remove the wheel blocks.