The Emergency Air Line (usually Red):

Supplies air to the trailer air tanks and controls the emergency brakes.. Section 6.2: The emergency line supplies air to the trailer tanks

The Emergency Air Line (usually Red):

ANSWER BREAKDOWN
  • A. Incorrect. "Controls the brake lights." is not correct. The emergency line supplies air to the trailer tanks and controls the emergency brakes.
  • B. Correct. The emergency line supplies air to the trailer tanks and controls the emergency brakes.
  • C. Incorrect. "Is only for testing." is not correct. The emergency line supplies air to the trailer tanks and controls the emergency brakes.
  • D. Incorrect. "Is painted blue." is not correct. The emergency line supplies air to the trailer tanks and controls the emergency brakes.