- 0 Incorrect (6 allowed to pass)
- 0 Correct
- Updated for February 2025
- Based on 2025 AZ commercial driver's license manual
Free Arizona CDL Air Brakes Test 2025
Do you want to operate commercial motor vehicles (CMVs) with air brakes? Our Arizona MVD CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt. Failing the air brakes knowledge test in Arizona results in a one-day waiting period and a retest fee. Until you pass, your CDL will include the restriction “L,” preventing you from operating CMVs with air brakes. Given Arizona’s diverse terrain, from high-heat deserts in the south to steep mountain descents (especially between Phoenix and Flagstaff), air brakes are essential for maintaining vehicle control. Major highways, including I-10, I-40, I-17, and Routes 60 and 87, are crucial for freight transport and present diverse challenges that rely heavily on air brakes and qualified drivers. Since most semi-trucks and tractor-trailers rely on air brakes, with this restriction, your job opportunities will be significantly limited.
Industries across the Grand Canyon State rely on drivers with the air brake qualification. Some key industries include tourism, mining, agriculture, and aerospace. Major companies requiring the air-brake qualification include Freeport-McMoran and Asarco in the mining sector and Knight Transportation, Swift Transportation, and XPO Logistics in the logistics sector. Additionally, charter bus companies like Greyhound Lines, Arrow Stage Lines, and Tour West America rely on air brakes-qualified drivers, as does virtually every school district in the state that operates full-size school buses. Having an “L” restriction on your CDL prevents you from legally operating CMVs with air brakes, making the above-listed jobs unattainable.
Our CDL Air Brakes Practice Tests help you master essential concepts and pass your official MVD Air Brakes Knowledge Test. The information you learn will also be useful as you practice inspecting and operating CMVs to pass your skills test. The skills test includes inspection, hands-on testing for air pressure and leaks, and air brake-equipped vehicle operation. The written Air Brakes knowledge test consists of multiple-choice questions based on the state’s CDL manual (Arizona CDL Handbook 2025) and requires a score of at least 80% to pass.
Our Practice Tests are designed to mimic what you will face on the official knowledge test and offer real-time feedback on all responses. This proven approach enhances retention, reinforces key concepts, and ensures you’re prepared to confidently pass the test on your first attempt.
- 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 AZ MVD exam
questions
correct answers to pass
passing score
List of questions (classic view)
- How would you check your truck's slack adjusters?
- Which of the following are true about a dual air brake system?
- Why must you pass a knowledge test on air brakes?
- Slack adjusters are
- Spring brakes are
- How do brakes work on a long, steep downgrade?
- Which of the following is NOT part of the drum brake?
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer with an antilock braking system (ABS)?
- At what measurement is the safety valve USUALLY set to open?
- When should you use the parking brake?
- After the initial pressure drop, the maximum acceptable leakage rates per minute are
- What is the best way to test your vehicle's low air pressure warning signal?
- Which of the following should you do before leaving your vehicle unattended?
- The tractor protection valve
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which vehicles must have low air pressure warning signals?
- Which of the following is NOT part of the air brake system?
- Which of the following can cause brakes to fade or fail?
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- An antilock braking system (ABS)
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- The purpose of a supply pressure gauge is
- When should you drain your air tanks?
- If the air tanks are not drained,
- Under which conditions are front wheel brakes good to use?
- 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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