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Cheat sheet
Question
Before beginning a trip, you should:
Answers
A.  Leave the service line valve open.
B.  Remove the relay valves.
C.  Close the emergency line valve.
Explanation
Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves and listening for escaping air. Close both shut-off valves before beginning to drive.

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