- Updated for January 2025
- Based on 2025 SD commercial driver's license manual
Free South Dakota CDL Air Brakes Test 2025
After you receive your air brake qualification, you can start looking for bigger and better paying jobs since you’ll stand out more in your field. But the first step is passing your air brake exam. And the first step to passing the exam is to study and take practice exams. This multiple-choice format practice exam features 30 questions written with information directly from the South Dakota Commercial Driver License Manual. Each explanation that accompanies the question contains information that you need to answer future questions correctly on your real air brake exam, so read them all closely. Study until you feel comfortable, and visit as often as necessary until your score reflects that you will pass with flying colors. Good luck on your exam, and drive safely, with and without air brakes soon!
- 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 SD DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- What is the best way to test your vehicle's low air pressure warning signal?
- After the initial drop, the maximum acceptable leakage rates per minute are
- Under which conditions are front wheel brakes good?
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)?
- If the air tanks are not drained,
- Which of the following can cause brakes to fade or fail?
- Which of the following is NOT part of the air brake system?
- When should you use the parking brake?
- When should you drain your air tanks?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- The tractor protection valve
- How would you check your truck's slack adjusters?
- Why must you pass a knowledge test on air brakes?
- An antilock braking system (ABS)
- Slack adjusters are
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Which of the following are true about a dual air brake system?
- 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?
- How do brakes work on a long, steep downgrade?
- The purpose of a supply pressure gauge is
- Which of the following should you do before leaving your vehicle unattended?
- Which vehicles must have low air pressure warning signals?
- At what measurement is the safety valve USUALLY set to open?
- Spring brakes are
- 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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Here's an inside look at how we maintain the highest quality in our practice tests.
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We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation. - Expert Content Creation:
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Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your DMV exam.
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