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

For Michigan CDL air-brake testing, what is the trailer protection valve, and where is it located?

A check valve on the tractor that automatically isolates the tractor air supply from the trailer if a trailer line breaks On the trailer axle Inside the cab heater On the drive shaft

Correct Answer:

A check valve on the tractor that automatically isolates the tractor air supply from the trailer if a trailer line breaks

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