- Updated for January 2025
- Based on 2025 KY commercial driver's license manual
Free Kentucky CDL Air Brakes Test 2025
The best way to pass the Kentucky CDL air brake exam is to practice early and often. The best way to practice is with a practice exam written specifically with the questions that the Kentucky Commercial Driver License Manual states that you need to know. The following 30 multiple-choice questions is based on these questions and other important material featured in your manual. Use the hint provided with each questions if you need it, and read each explanation so that you are prepared for future questions on your real examination. Practice until you achieve a score that you feel confident in, and good luck on the road to safer air brake driving!
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual KY KSP exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- When should you drain your air tanks?
- Which of the following is NOT part of the air brake system?
- Why must you pass a knowledge test on air brakes?
- Slack adjusters are
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- Which of the following should you do before leaving your vehicle unattended?
- The purpose of a supply pressure gauge is
- What is the best way to test your vehicle's low air pressure warning signal?
- Which of the following can cause brakes to fail or fade?
- Under which conditions are front wheel brakes good?
- Which vehicles must have low air pressure warning signals?
- Spring brakes are
- Which of the following are true about a dual air brake system?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- If the air tanks are not drained,
- After the initial drop, the maximum acceptable leakage rates per minute are
- An anti-lock braking system (ABS)
- When should you use the parking brake?
- Which of the following is NOT part of the drum brake?
- The tractor protection valve
- How do brakes work on a long, steep downgrade?
- At what measurement is the safety valve USUALLY set to open?
- How do you check your truck's slack adjusters?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
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