Practice question

Before a trip, you should ensure that air flows to all trailers by:

  1. Closing the rear shut-off valves and listening for escaping air.
  2. Opening the rear shut-off valves and listening for escaping air.
  3. Disconnecting air supply lines and listening for escaping air.
  4. Detaching and reattaching the rear shut-off valves.

Answer: B — Opening the rear shut-off valves and listening for escaping air.

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