Practice question

What is the correct setting for shut-off valves at the rear of the last trailer?

  1. Rear shut-off valves on the last trailer must be closed so the system holds air.
  2. open to exhaust air
  3. removed for triples
  4. used to steer the dolly

Answer: A — Rear shut-off valves on the last trailer must be closed so the system holds air.

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