Q
76. Describe what the service line is for?
Combination Vehiclesmedium
Aa. To carry air to the parking brake to control the trailer brakes.
Bb. To carry air to a relay valve that allows the trailer brakes to be applied quickly.
Cc. To carry air to the cab of the rig to cool it.
Detailed Explanation
The correct answer is "b. To carry air to a relay valve that allows the trailer brakes to be applied quickly.". This is based on federal CDL regulations and safety standards.
Correct Answer: b. To carry air to a relay valve that allows the trailer brakes to be applied quickly.
Advertisement
Ready to practice for real?
Take our free, full-length Combination Vehicles practice test. Simulates the actual DMV exam with timed questions.
Start Practice TestRelated Questions
Using the trailer hand brake while experiencing a trailer jackknife will:
combination-vehiclesmedium
Before a drive, ensure that air flows to all trailers by:
combination-vehiclesmedium
40. A driver crosses the air lines when hooking up to an old trailer. What will happen?
combination-vehiclesmedium
After finishing a pre-trip inspection, you should:
combination-vehiclesmedium
The 'crack-the-whip' effect can:
combination-vehiclesmedium
Advertisement