- Updated for January 2025
- Based on 2025 CT commercial driver's license manual
Free Connecticut CDL Air Brakes Test 2025
Your knowledge of air brakes will be tested by answering 30 multiple-choice questions that will allow you to get a less restricted CDL for driving with air brakes and to help you become a safer driver today. These questions, which each include a hint and explanation, are carefully written based on the Connecticut Commercial Driver’s Manual and local laws. Review each question and explanation carefully so that you will be fully prepared for the DMV air brake exam, and so that you understand the workings of your vehicle’s air brakes, which will help you become a safe driver. Good luck on your upcoming exam and drive 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 CT DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- How would you check your truck's slack adjusters?
- After the initial pressure drop, the maximum acceptable leakage rates per minute are
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer with an antilock braking system (ABS)?
- The purpose of a supply pressure gauge is
- Which vehicles must have low air pressure warning signals?
- Which of the following can cause brakes to fade or fail?
- If the air tanks are not drained,
- When should you use the parking brake?
- Which of the following are true about a dual air brake system?
- Why must you pass a knowledge test on air brakes?
- When should you drain your air tanks?
- Under which conditions are front wheel brakes good to use?
- How do brakes work on a long, steep downgrade?
- Which of the following should you do before leaving your vehicle unattended?
- The tractor protection valve
- Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
- Which of the following is NOT part of the drum brake?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- An antilock braking system (ABS)
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Spring brakes are
- Slack adjusters are
- At what measurement is the safety valve USUALLY set to open?
- 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?
- 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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