Alberta Air Brake (Q) Knowledge Test Practice Questions - Alberta Air Brake (Q Endorsement) Knowledge Test Exam - Variant 2

On a tractor-trailer, what is the control (service) line's main function?

Fill the tractor fuel tank Drain the wet tank every time the trailer is coupled Release the fifth-wheel jaws automatically Carry the brake application signal from tractor to trailer

Correct Answer:

Carry the brake application signal from tractor to trailer

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