GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2000 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Brakes 🢒 Air Brakes 🢒 Rear Quick Release Double Check Valve Leak Test
  1. Block the wheels.
  2. Disconnect the air line from the balance port.
  3. Start the engine.
  4. Charge the air system to the air compressor governor cut-out point.
  5. Stop the engine.
  6. Push in the park control knob.

    7. Object Number: 227875 Size: SH
  7. Inspect the quick release valve (double check type) exhaust port and the balance port for air leakage. Air leakage less than 25.4 mm (1 in) bubble in five seconds is acceptable.

    8. If the air leakage is excessive, overhaul or replace the quick release valve (double check type).

  8. Connect the air line to the balance port.
  9. Pull out the park control knob.
  10. Disconnect the air line from the supply port.
  11. Have an assistant apply the brake pedal.
  12. Inspect the supply port for any leakage. The air leakage should be less than 25.4 mm (1 in) bubble in five seconds.

    13. If the air leakage is excessive, overhaul or replace the quick release valve (double check type).

  13. Inspect the seam between the body and cover for any air leakage. If any bubbles appear, overhaul or replace the quick release valve (double check type).
  14. Connect the air line at the supply port.
  15. Inspect the air lines for leaks.
  16. Remove the wheel blocks.