What can happen if the air lines are crossed when connecting a tractor to a trailer?
a.Nothing, the lines are the same
b.The trailer brakes may not work correctly, creating a dangerous situation
c.The engine will not start
d.The fifth wheel will not lock
Explanation
If the air lines are crossed between the tractor and trailer, the brakes will not function properly. The service and supply lines serve different purposes, and crossing them can prevent brakes from applying when needed.