Air-Activated Kingpin Unlock, Jost Fifth Wheels
108SD d 17.03.004
- Verify that both the yellow parking-brake and red trailer air supply knobs are out, the vehicle and trailer parking brakes are set, and that the trailer is prepared for uncoupling.
- Release the vehicle parking brake.
- Pull and hold the kingpin release valve, then drive forward slowly.
- After the trailer has slid down the fifth wheel and pick-up ramps, let go of the kingpin release valve.
Note: If the trailer parking brake is not set, the air-actuated valve will not activate.
Note: