BC Transit – Air Brake Course

Connecting the Trailer Air Lines and Electrical Cable
(Step 3)
“Glad Hand” couplers are used to connect the air lines of the tractor and the trailer.
•They are identical in design with no left or right. (they may be coloured red and green)
•They are firmly attached to the front of the trailer and are at the ends of the air lines leading
away from the rear of the tractor behind the cab.
•A rubber seal provides an air tight fit (it should be checked for wear)
•A screen inside the opening prevents grit from entering the system. (check it, too.)
•To join them together, hold them face to face at a 90 degree angle to each other. Snap down
and turn them until they lock together.
•When not in use (bobtailing) they should be coupled to the “dead end” couplers on the back
of the tractor so they remain clean.
•Remember to plug in the power cable for the lights and signals on the trailer.
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