- 0 Incorrect (6 allowed to pass)
- 0 Correct
- Updated for February 2025
- Based on 2025 KY commercial driver's license manual
Free Kentucky CDL Air Brakes Test 2025
A CDL without an air brake restriction is essential for maximizing your job prospects since most semi-trucks and tractor-trailers rely on air brakes. Failing to pass the Kentucky KSP CDL Air Brakes Knowledge Test results in an “L” restriction, preventing you from operating vehicles equipped with air brakes. Failing the test also results in a one-day waiting period and a retest fee. Our Kentucky KSP CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt.
From Kentucky’s western Flatlands to the steep inclines of the eastern Appalachian region, large CMVs require reliable air brakes to navigate safely. Additionally, the humid climate and wet roads necessitate precise braking systems and drivers who are authorized to operate them. Key freight transportation routes include I-75 (north-south transport), I-64 (linking Louisville and Lexington), I-65 (linking Louisville to Nashville), and the parkways (connecting rural areas to urban parts of the state). The “L” restriction severely limits your driving options on these highways and the many jobs they provide.
Industries across the Bluegrass State that rely on drivers with the air brake qualification include automotive manufacturing, logistics, and agriculture. Major companies requiring the air brakes qualification include UPS Worldport, FedEx Freight, and J.B. Hunt in logistics as well as Ford (Louisville) and Toyota (Georgetown) in manufacturing. Lexington Bluegrass Tours and Miller Transportation are two charter bus companies in the state that require air brakes-qualified drivers. So do school districts operating thousands of full-size school buses. The “L” restriction makes operating CMVs equipped with air brakes illegal, eliminating the above-listed employment options.
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (Kentucky CDL Handbook 2025) and requires a minimum score of 80% to pass. Our CDL Air Brakes Practice Tests cover all essential knowledge for the official KSP Air Brakes knowledge test. The information you learn will also be useful as you practice inspecting and operating CMVs to pass your skills test, which includes inspecting components, testing for air pressure and leaks, and operating air brake-equipped vehicles.
Our Practice Tests are designed to resemble what you will face on the official test and offer real-time feedback on all responses. This scientifically proven approach improves material retention and ensures you’re prepared to pass the test.
- 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
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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We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation. - Expert Content Creation:
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