- Updated for January 2025
- Based on 2025 AZ commercial driver's license manual
Free Arizona CDL Air Brakes Test 2025
Today, you will have the opportunity to answer 30 multiple-choice questions about air brakes in order to prepare for the DMV commercial driver exam on air brakes and to become a safer driver.
These questions have been carefully written based on real DMV questions, as well as information from the Arizona Commercial Drivers License Manual and applicable Arizona laws. Along with each question, you will find a hint and explanation. To prepare for the real DMV exam, it is recommended that you read each explanation as this will help you have a better understanding of the material discussed.
Good luck today on your air brake test, and keep driving safely!
- 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
Helpful links
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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