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

What is the primary purpose of the trailer service line?

To charge the trailer spring brakes with supply air To transmit application signal pressure from the tractor treadle valve to apply the trailer service brakes To bypass the tractor protection valve in case of emergency To return exhaust air from the trailer back to the tractor cab

Correct Answer:

To transmit application signal pressure from the tractor treadle valve to apply the trailer service brakes

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