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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. When driving in a construction zone, if a construction worker is near the road, you should:
further reduce your speed.
come to a complete stop.
maintain a constant speed.
2. Typically an air system is fully-charged at:
75 psi
125 psi
25 psi
3. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
"S" stands for "Shoes".
it is shaped like the letter "S".
it applies a "Shock" to the brakes.
4. If you're feeling tired while driving you should:
stop driving and get some rest.
drink coffee.
eat something.
5. Which of the following statements is true?
Carrying a properly charged and rated fire extinguisher will help prevent fires.
Poor cargo ventilation is a common cause of fire.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
6. When the spring brakes are on, you should push the brake pedal down:
Only when driving downhill.
Only when driving uphill.
7. ABS helps you:
steer gently and smoothly while you are braking.
increase your normal braking capability.
avoid wheel lock up and maintain control of your vehicle when you brake.
8. If are being followed closely, you should:
change lanes quickly.
decrease your following distance.
increase your following distance.
9. You supply air to the trailer brake system by:
plugging the electrical cord into the trailer.
connecting the tractor service air line to the trailer service glad hand.
pushing in the trailer air supply knob.
10. What is an important thing to remember about emergency braking?
You should never use stab braking.
Pushing down on the brake pedal as hard as you can will only keep the wheels locked up and cause a skid.
Your natural response (hitting the brakes) is never the right solution.
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VT CDL Air Brakes 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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