Q
Pull out the trailer air supply control to test:
Combination Vehiclesmedium
AThe trailer lights
BThe trailer emergency brakes
CThe air compressor
Detailed Explanation
The correct answer is "The trailer emergency brakes". This is based on federal CDL regulations and safety standards.
Correct Answer: The trailer emergency brakes
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
To test the trailer service brakes, you should:
combination-vehiclesmedium
51. When you are uncoupling a loaded trailer, lower the landing gear until it:
combination-vehiclesmedium
56. You have coupled with a semitrailer. Where should you put the trailer supports before driving away?
combination-vehiclesmedium
82. How long does it take a typical tractor-trailer to clear a single track? A double track?
combination-vehiclesmedium
81. When a vehicle is carrying a load at night, which extends four feet or more beyond the rear of the body, there must be __ at the extreme end of the load.
combination-vehiclesmedium
Advertisement