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

If a trailer with spring parking brakes loses supply-line pressure in a breakaway, what typically happens?

The trailer reservoirs refill from the road surface The tractor ABS turns off all braking The trailer hand valve becomes the parking brake The trailer spring parking brakes apply

Correct Answer:

The trailer spring parking brakes apply

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