What is the purpose of the service air line?
A. To service the air control supply.
B. To service the tractor air brakes.
C. To carry air to the trailer service brakes.
Answer: C. To carry air to the trailer service brakes.
A. To service the air control supply.
B. To service the tractor air brakes.
C. To carry air to the trailer service brakes.
Answer: C. To carry air to the trailer service brakes.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.