GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Brakes 🢒 Air Brakes 🢒 Air Brake Park Control Valve Leakage Test
  1. Block the wheels.
  2. Start the engine.
  3. Charge the system air pressure to the governor cut-out point.

    4. Object Number: 202448 Size: SH
  4. Pull out the system park knob (3) and release the brake pedal.
  5. Apply a soap solution to the exhaust port.
  6. Check the exhaust port for leakage. Slight leakage is permissible.
  7. If leakage is excessive, replace the valve (7).
  8. Push in the system park knob (3).
  9. Remove the wheel blocks.