- Updated for January 2025
- Based on 2025 MA commercial driver's license manual
Free Massachusetts CDL Air Brakes Test 2025
The best way to succeed as a truck driver in Massachusetts is to be as unlimited as possible and that means being able to drive a vehicle with air brakes. This exam features 30 multiple-choice questions based on the information in the Massachusetts Commercial Driver’s License Manual that are necessary for you to receive your air brakes qualification. The more often you practice, and read each question’s explanation, the more comfortable you will be, and the more likely to pass your exam with flying colors. Then, the more chances you’ll have for success as you can drive a wider range of commercial vehicles. So, start practicing today, come back as often as possible, and good luck both now, and on your real MassDOT CDL air brake exam in the future!
- 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 MA RMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- Which of the following can cause brakes to fade or fail?
- The purpose of a supply pressure gauge is
- 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)?
- When should you use the parking brake?
- Which of the following is NOT part of the drum brake?
- At what measurement is the safety valve USUALLY set to open?
- If the air tanks are not drained,
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- How do brakes work on a long, steep downgrade?
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following are true about a dual air brake system?
- An anti-lock braking system (ABS)
- Slack adjusters are
- When should you drain your air tanks?
- The tractor protection valve
- What is the best way to test if your vehicle's spring brakes come on automatically?
- How do you check your truck's slack adjusters?
- Which of the following is NOT part of the air brake system?
- What is the best way to test your vehicle's low air pressure warning signal?
- Which vehicles must have low air pressure warning signals?
- Under which conditions are front wheel brakes good?
- Spring brakes are
- After the initial drop, the maximum acceptable leakage rates per minute are
- Why must you pass a knowledge test on air brakes?
- 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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