What is the emergency air line?
a) Air lines connecting the parking brake to the trailer brakes
b) Air lines that control the emergency brakes on combination vehicles
c) Air lines that control the emergency brakes of the tractor
Answer: b) Air lines that control the emergency brakes on combination vehicles
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.