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Before a trip, you can make sure air flows to all trailers by:
A.  Checking for moving air inside of each trailer.
B.  Listening for air at the rear shut-off valve.
C.  Feeling for air at the front shut-off valve.
Before a trip, ensure that air in the air brake system reaches all trailers. Do this by waiting for air pressure to build, then sending air to both the emergency and service lines and opening the shut-off valves on the rear of the last trailer. If air escapes from the shut-off valves in the rear of the combination, the air is being supplied to the entire vehicle.

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