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  • Updated for June 2025
  • Based on 2025 KS commercial driver's license manual

Free Kansas CDL Air Brakes Test 2025

Planning to drive commercial motor vehicles (CMVs) with air brakes? Our Kansas DMV CDL Air Brakes Practice Tests are designed to help you confidently prepare for your knowledge exam and pass on the first attempt. Failing the air brakes test in Kansas results in a one-day waiting period and a fee before you can retake it. If you don’t pass, your CDL will include the “L” restriction, preventing you from operating CMVs with air brakes. Air brakes are essential for safely navigating Kansas, especially in the Flint Hills region, where rolling hills, gradual slopes, and high winds demand precise control. Transportation routes such as I-70 (linking Kansas City, Topeka, and Salina), I-35, and Routes 54 and 81 are vital for agricultural and freight transport, and most semi-trucks and tractor-trailers rely on air brakes. Thus, restriction “L” would limit both your driving options and your access to many job opportunities.

Industries throughout the Sunflower State depend on drivers with air brake qualifications to run smoothly. Key industries include agriculture, manufacturing, and energy. Major companies requiring the air-brake qualification include Scoular and ADM Grain in the agriculture sector as well as XPO Logistics, Old Dominion Freight Line, and FedEx Freight in the logistics industry. Charter bus companies like Village Tours & Travel (Wichita), Arrow Stage Lines (Kansas City), and Prestige Bus Lines (Topeka) also rely on air brake-qualified drivers. Additionally, thousands of full-size school buses statewide are equipped with air brakes. The “L” restriction makes operating CMVs equipped with air brakes illegal, limiting your access to countless job opportunities.

Our CDL Air Brakes Practice Tests cover all essential knowledge for the official DMV Air Brakes knowledge test. This information will also prove valuable as you practice inspecting and operating CMVs to pass your skills test, which involves inspecting components, testing air pressure and leaks, and operating air brake-equipped vehicles. The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Kansas CDL Handbook 2025) and requires a score of at least 80% to pass.

Our Practice Tests are carefully designed to mimic the content and format of the official knowledge test while providing real-time feedback on all responses. This scientifically proven approach enhances material retention and ensures you’re fully prepared to pass the test and advance your career in commercial driving.

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KS commercial driver's license
  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
  • Triple-checked for accuracy

What you need to know

4.45 out of 5 • 22 votes
9 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.

What to expect on the actual KS DMV exam

25

questions

20

correct answers to pass

80%

passing score

List of questions (classic view)

  1. How would you check your truck's slack adjusters?
  2. Under which conditions are front wheel brakes good?
  3. Which of the following can cause brakes to fail or fade?
  4. The tractor protection valve
  5. When should you use the parking brake?
  6. After the initial drop, the maximum acceptable leakage rates per minute are
  7. How do brakes work on a long, steep downgrade?
  8. Which vehicles must have low air pressure warning signals?
  9. If the air tanks are not drained,
  10. How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
  11. 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)?
  12. Which of the following are true about a dual air brake system?
  13. Why must you study air brakes in the state of Kansas?
  14. Slack adjusters are
  15. Which of the following is NOT part of the drum brake?
  16. What is the best way to test if your vehicle's spring brakes come on automatically?
  17. Which of the following should you do before leaving your vehicle unattended?
  18. Spring brakes are
  19. When should you drain your air tanks?
  20. An anti-lock braking system (ABS)
  21. What is the best way to test your vehicle's low air pressure warning signal?
  22. At what measurement is the safety valve USUALLY set to open?
  23. Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
  24. Which of the following is NOT part of the air brake system?
  25. The purpose of a supply pressure gauge is
  26. The low air pressure warning signal will come on before the pressure in the air tanks falls below
  27. A low pressure warning signal is required on
  28. All vehicles equipped with air brakes have
  29. With air brake-equipped vehicles, the parking brakes should be used
  30. The use of air brakes on a downgrade is only a supplement to the
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