Michigan CDL Air Brakes Practice Questions - Michigan CDL Air Brakes Knowledge Test Exam

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For an Michigan CDL air-brake vehicle, can the trailer hand valve (trolley valve) be used to hold a parked combination vehicle in place?

Yes, always No — it can release if air leaks; use the parking brake instead Only on hills Only when the trailer is empty

Correct Answer:

No — it can release if air leaks; use the parking brake instead

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