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- Updated for January 2025
- Based on 2025 MI commercial driver's license manual
Free Michigan CDL Air Brakes Test 2025
Today, you will have an opportunity to become a better, safer, and possibly even more successful commercial driver in the state of Michigan, as you prepare to get your air brake qualification. With the air brake qualification, you can drive a wider range of commercial vehicles and this may qualify you for more jobs and help you stand out – the sky is the limit! This 30 question multiple-choice format practice exam is closely based on the questions featured in the Michigan Commercial Driver License Manual that have necessary information about safely driving a commercial vehicle with air brakes. You’ll also find each questions has an explanation written with information directly from the manual, so read each one closely. Study early and practice as often as you need to until you achieve a score that you feel comfortable with. Good luck on your exam, and you’ll soon be driving safely with air brakes!
- 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 MI DOS 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?
- Which vehicles must have low air pressure warning signals?
- Which of the following is NOT part of the drum brake?
- Which of the following are true about a dual air brake system?
- Which of the following can cause brakes to fade or fail?
- Spring brakes are
- How do brakes work on a long, steep downgrade?
- If the air tanks are not drained,
- What is the best way to test your vehicle's low air pressure warning signal?
- How do you check your truck's slack adjusters?
- After the initial drop, the maximum acceptable leakage rates per minute are
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- The purpose of a supply pressure gauge is
- At what measurement is the safety valve USUALLY set to open?
- Which of the following should you do before leaving your vehicle unattended?
- An anti-lock braking system (ABS)
- Why must you pass a knowledge test on air brakes?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- When should you drain your air tanks?
- The tractor protection valve
- When should you use the parking brake?
- 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)?
- Under which conditions are front wheel brakes good?
- Slack adjusters are
- Which of the following is NOT part of the air brake system?
- 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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