Ontario Air Brake Z Test Practice Questions - Ontario Air Brake (Z Endorsement) Knowledge Test Exam

What is the normal role of the red, eight-sided trailer supply valve?

It measures tank pressure It controls windshield wipers It supplies air to the trailer brake system through the supply line when pushed in It applies only steering axle service brakes

Correct Answer:

It supplies air to the trailer brake system through the supply line when pushed in

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