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Updated for December 2024
Based on 2024 DE commercial driver's license manual

Free Delaware CDL Air Brakes Test 2024

This practice test will help you prepare for the real DMV qualification to drive a vehicle with air brakes and help you to become a better driver starting today.

The 30 multiple-choice questions is based directly on the Delaware Commercial Driver License Manual and applicable Delaware laws. You should also pay attention to the hint and explanation provided with each question, as these will make you more prepared for your actual exam. Practice as often as necessary until you achieve a passing score and feel comfortable with the information. Good luck, keep practicing, and drive safely!

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Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
Triple-checked for accuracy

What you need to know

4.38 out of 5 • 8 votes

9 min to complete

Available in EN and ES

Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.

What to expect on the actual DE DMV exam

questions

correct answers to pass

80%

passing score

Helpful links

DE DMV website

Official Delaware CDL manual (2024)

List of questions (classic view)

At what measurement is the safety valve USUALLY set to open?
The tractor protection valve
Which of the following is NOT part of the drum brake?
Which of the following are true about a dual air brake system?
Which vehicles must have low air pressure warning signals?
An antilock braking system (ABS)
Which of the following can cause brakes to fade or fail?
When should you use the parking brake?
Which of the following should you do before leaving your vehicle unattended?
How would you check your truck's slack adjusters?
What is the best way to test your vehicle's low air pressure warning signal?
The purpose of a supply pressure gauge is
How do brakes work on a long, steep downgrade?
Which of the following is NOT part of the air brake system?
Which of the following will be true about your brake function if your antilock braking system (ABS) fails?
Why must you pass a knowledge test on air brakes?
Spring brakes are
After the initial pressure drop, the maximum acceptable leakage rates per minute are
If the air tanks are not drained,
Which of the following is NOT part of the braking process when you're driving a tractor-trailer with an antilock braking system (ABS)?
What is the best way to test if your vehicle's spring brakes come on automatically?
How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
Slack adjusters are
Under which conditions are front wheel brakes good to use?
When should you drain your air tanks?
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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DE CDL Air Brakes Test (you are here)

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Our commitment to accuracy and quality in our practice tests

Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.

Written by Andrei Zakhareuski Updated over a week ago

At Driving-Tests.org, we understand the importance of reliable and accurate practice tests to help you prepare for your DMV exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.

Here's an inside look at how we maintain the highest quality in our practice tests.

Content Creation and Verification Process

Alignment with Official Manuals:
Every question we develop is based on the most recent version of each state's official driving manual. Our team regularly monitors each state DMV's website for the latest updates to ensure our practice tests are always aligned with the most current information.
Community Feedback Integration:
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:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy.
Rigorous Review Process:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors.
User Feedback Mechanism:
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Responsive Updates:
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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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