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

Operational Test
  1. Block the wheels.
  2. Start the engine.
  3. Charge the system to the air compressor governor cut-out point.
  4. Stop the engine.
  5. Ask an assistant to apply and release the brake pedal several times.

    6. Object Number: 201468 Size: SH
  6. Verify that a discharge or air occurs at the reservoir drain valve (automatic type) exhaust port.

    7. If a discharge of air does not occur, clean, overhaul, or replace the reservoir drain valve (automatic type).

  7. Remove the wheel blocks.

Air Leakage Test
  1. Block the wheels.
  2. Start the engine.
  3. Charge the system to the air compressor governor cut-out point.
  4. Stop the engine.
  5. Cover the exhaust port and the seams with a soap solution. If air leakage appears, overhaul or replace the reservoir drain valve (automatic type).
  6. Remove the wheel blocks.