Practice question

What is the function of the tractor protection valve in the air brake system?

It controls the steering wheel stability
It protects the tractor's air supply by closing if the trailer breaks away or develops a severe air leak
It filters moisture from the air compressor
It limits the pressure going to the steering axle brakes

Answer: B — It protects the tractor's air supply by closing if the trailer breaks away or develops a severe air leak

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