The 'Shut-off Valve' (or cut-out cock) on the rear of the trailer must be:

Closed.. Section 6.2: The shut-off valves at the back of the last trailer must be closed to hold air in the system.

The 'Shut-off Valve' (or cut-out cock) on the rear of the trailer must be:

ANSWER BREAKDOWN
  • A. Incorrect. "Open." is not correct. The shut-off valves at the back of the last trailer must be closed to hold air in the system.
  • B. Correct. The shut-off valves at the back of the last trailer must be closed to hold air in the system.
  • C. Incorrect. "Removed." is not correct. The shut-off valves at the back of the last trailer must be closed to hold air in the system.
  • D. Incorrect. "Painted red." is not correct. The shut-off valves at the back of the last trailer must be closed to hold air in the system.