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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Vermont CDL knowledge test. The VT CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Vermont CDL Manual. Take this VT CDL practice test now to prepare for the actual air brakes test!
1. To make the brakes work, air brakes use:
compressed air.
hydraulic air.
2. When using a fire extinguisher, you should stay:
as close to the fire as possible, without getting burnt.
as far away from the fire as possible.
at least 10 feet away from the fire.
3. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line causes:
the trailer emergency brakes to come on.
the speed of your vehicle to increase.
the trailer spring brakes to come on.
4. The safety valve is usually set to open at:
150 psi.
100 psi.
200 psi.
5. On front tires, tread should be at least:
4/32 inch
4/16 inch
2/32 inch
6. Combination vehicles have __ air lines.
7. Before starting down a hill, you should:
slow down and shift to a lower gear.
look for an escape route.
release the accelerator and shift to Neutral at the same time.
8. Brakes out of adjustment can cause the other brakes to:
apply more braking power.
last longer.
overheat and fade.
9. Tar in the road pavement rising to the road surface in very hot weather:
causes the road to become very slippery.
is very sticky and will slow down your vehicle.
does not affect the road surface or driving conditions.
10. When a tire fails, you must:
hold the steering wheel firmly.
stay off the brake.
All of the above.
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VT Air Brakes CDL Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Number of questions: 25
Correct answers to pass:20
Passing score:80%
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