Jost Fifth Wheels Air-Activated Kingpin Unlock
p3 dm 18.03.003
- Verify that both the yellow parking-brake and red trailer-air-supply knobs are out, the tractor and trailer parking brakes are set, and that the trailer is prepared for uncoupling.
- Release the tractor 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, release the pull valve.
Note: With Jost fifth wheels, if the trailer parking brake is not set the air-actuated valve will not activate.
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