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

On the Michigan CDL Air Brakes test, what is the function of the relay valve in trailer air brake systems?

It speeds up the application and release of air to the trailer brake chambers because the chambers are far from the foot valve It cools the brake drums It dries the air It applies the parking brakes

Correct Answer:

It speeds up the application and release of air to the trailer brake chambers because the chambers are far from the foot valve

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