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

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On the Michigan CDL Air Brakes test, how should you safely apply the trailer brakes only, for example to test the trailer's emergency function?

With the foot valve By pulling the red 8-sided trailer air supply knob OUT, which exhausts the supply line and applies the trailer spring brakes Using only the parking brake Disconnecting the glad hands

Correct Answer:

By pulling the red 8-sided trailer air supply knob OUT, which exhausts the supply line and applies the trailer spring brakes

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