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

What happens to the trailer brakes if the supply (emergency) line breaks?

The trailer service brakes apply using the tractor foot pedal only The tractor protection valve closes, and the trailer emergency spring brakes apply immediately The air compressor switches to fast-pumping mode to compensate The tractor rear brakes lock up while the trailer continues to roll

Correct Answer:

The tractor protection valve closes, and the trailer emergency spring brakes apply immediately

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