freightliner Cargo Manual page 117

3. Chock the front and rear of the trailer tires to pre-
vent the trailer from moving.
WARNING
Do not use the trailer service brakes for parking;
they are not designed for this purpose. If air bleeds
out of the trailer air tank during parking, the vehicle
could roll causing serious personal injury or prop-
erty damage.
4. Lower the trailer landing gear until the weight is re-
moved from the fifth wheel.
5. Disconnect the tractor-to-trailer air system lines and
electrical cable. Plug the air lines to prevent dirt or
foreign material from entering the lines.
6. Release the kingpin locking mechanism by lifting
the safety latch and pulling the lock control handle
to the unlocked position. See
7. Slowly drive the tractor away from the trailer.
Fig. 11.6.
Fifth Wheels
11.10