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

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On the Michigan CDL Air Brakes test, when uncoupling a trailer with air brakes, what should you do BEFORE disconnecting the glad hands?

Drain all air tanks Apply the trailer parking (spring) brakes by pulling the red trailer air supply knob out, then disconnect the glad hands Start the engine Apply the foot brake hard

Correct Answer:

Apply the trailer parking (spring) brakes by pulling the red trailer air supply knob out, then disconnect the glad hands

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