GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2002 🢒 Isuzu T-Series (Truck Line C) 🢒 Brakes 🢒 Air Brakes 🢒 Air Brake Double Check Valve Leakage Test
  1. Block the vehicle wheels.
  2. Drain all of the air reservoirs. Refer to Draining Reservoirs

    3. Object Number: 227886 Size: SH
  3. Remove the double check valve.
  4. Plug the delivery port.
  5. Connect an air supply to one of the supply ports. Apply approximately 861 kPa (125 psi) of air pressure.
  6. Apply a soap solution to the opposite supply port.
  7. Check that the leakage is less than a 25 mm (1 inch) bubble in 5 seconds. If the leakage exceeds these specifications, repair or replace the valve.
  8. Disconnect the air supply and repeat steps 4 through 6 on the other supply port.
  9. Shut off and disconnect the air supply.
  10. Unplug the delivery port.
  11. Install the double check valve.
  12. Start the engine.
  13. Charge the air supply system to the air compressor governor cut-out point.
  14. Stop the engine.
  15. Check for proper brake operation.
  16. Remove the wheel blocks.