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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 Kansas CDL knowledge test. The KS 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 Kansas CDL Manual. Take this KS CDL practice test now to prepare for the actual air brakes test!
1. An anti-lock braking system (ABS):
helps you avoid wheel lock up.
helps you avoid skids caused by over braking.
should help you steer around an obstacle while braking.
All of the above.
2. Front brake limiting valves were used to:
reduce the chance of the front wheels skidding on slippery surfaces.
prevent overheating of the front tires.
reduce your speed so further braking or shifting is not required.
reduce exhaust emissions.
3. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
right; right
left; right
right; left
left; left
4. Empty trucks:
require greater stopping distances.
have less traction.
are higher than loaded trucks.
All of the above.
5. Most hydraulic brake failures occur for one of two reasons, one of which is:
relying too much on the engine braking effect.
excessive downshifting.
loss of hydraulic pressure.
driving in cold weather.
6. If you're feeling tired while driving you should:
drink coffee.
increase your speed to get to your destination quicker.
stop driving and get some rest.
eat something.
7. Which of the following is NOT correct? An ABS system:
is a safety anti-skid braking system.
helps you stop faster.
helps you avoid wheel lock up.
reduces the braking pressure to a safe level.
8. You should drain the air tanks completely. If water and oil collect in the air tanks:
your brakes could heat up.
your brakes could become hard to press.
your brakes could fail.
None of the above.
9. What is the best way to test the low air pressure warning signal?
step on and off the brake pedal while the engine is running.
pump the brakes until the air pressure drops below 45 psi.
Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
All of the above.
10. Brake fade results from:
excessive wear.
excessive use of the service brakes.
excessive speeding.
excessive smoke.
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KS 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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