freightliner cascadia Driver Manual page 179

allow disengagement of the tractor from the
trailer, possibly resulting in serious personal in-
jury or death.
6.
Set the air-slide switch to LOCK. Visually inspect
the locking wedges or plungers to make sure
that they are fully inserted in the slide rail slots.
Verify that the plungers have engaged by tugging
the tractor forward while the trailer brakes are
locked and the wheels are chocked.
NOTE: The fifth wheel may need to be moved
slightly to enable the locking wedges to fully
lock.
Fifth Wheels
18.10