BC Transit – Air Brake Course

Parts of the Trailer (van style)
1) Wheel blocks: trailers not equipped with spring brakes, must be blocked
whenever they are to be left alone for more than 15 minutes. After that time, it can
be assumed all air has bled away, and no brakes are working.
2) Crank: allows the trailer to be raised or lowered to meet the height
requirements of the towing tractor. It has two speeds or “gears.” Push or pull the
handle to change gears.
3) “King Pin”: a steel pin that fits into the “fifth wheel” of the tractor. It connects
the two units and the trailer swivels around it.
4) The air line
connectors and cable to
carry power to the lights
and turn signals.
5) Landing gear:
supports the
trailer when
disconnected.
4
3
2
5
1
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