GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Low Air Pressure Switch Replacement

Removal Procedure
  1. Apply the parking brake.
  2. Block the wheels.
  3. Drain all the reservoirs. Refer to Air Brake Reservoir Draining.
  4. Disconnect the wiring harness connector.

    5. Object Number: 1488136 Size: SH
  5. Remove the low air pressure switch.

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1488136 Size: SH
  1. Install the low air pressure switch.

    2. Tighten
    Tighten the low air pressure switch to 12 N·m (106 lb in).

  2. Connect the wiring harness connector.
  3. Start the engine.
  4. Charge the system air pressure to the governor cut-out point.
  5. Inspect for leaks with a soap solution around the low air pressure switch. Leakage is not permissible.
  6. Inspect for proper operation. Refer to Low Air Pressure Switch Operational Check.
  7. Remove the wheel blocks.