Practice question
What happens if the red emergency air line between tractor and trailer ruptures or becomes disconnected while driving?
- Trailer air pressure escapes instantly, and the trailer emergency spring brakes lock up automatically to halt the trailer
- The trailer begins coasting freely without brakes
- The tractor engine shuts off immediately
- The trailer electrical lights become brighter
Answer: A — Trailer air pressure escapes instantly, and the trailer emergency spring brakes lock up automatically to halt the trailer
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