Saskatchewan Air Brake Practice Questions - Saskatchewan Air Brake (Endorsement A) Exam

What happens to the trailer supply valve (red knob) when the tractor parking brake valve (yellow knob) is pulled out?

It remains pushed in, keeping the trailer brakes released It typically pops out automatically, applying the trailer parking brakes It opens the safety pop-off valve on the trailer It increases the air pressure in the trailer service line

Correct Answer:

It typically pops out automatically, applying the trailer parking brakes

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