The shut-off valves at the rear of the LAST trailer must be:

Closed.. Section 7.2: The valves on the very last trailer must be CLOSED to hold the air pressure in the system.

The shut-off valves at the rear of the LAST trailer must be:

ANSWER BREAKDOWN
  • A. Incorrect. "Open." is not correct. The valves on the very last trailer must be CLOSED to hold the air pressure in the system.
  • B. Correct. The valves on the very last trailer must be CLOSED to hold the air pressure in the system.
  • C. Incorrect. "Connected to the dolly." is not correct. The valves on the very last trailer must be CLOSED to hold the air pressure in the system.
  • D. Incorrect. "Leaking." is not correct. The valves on the very last trailer must be CLOSED to hold the air pressure in the system.