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View All Plans- Updated for March 2025
- Based on 2025 DE commercial driver's license manual
Free Delaware CDL Air Brakes Test 2025
Planning to drive commercial motor vehicles (CMVs) equipped with air brakes? Passing the CDL Air Brakes test is essential for operating large commercial motor vehicles (CMVs) in Delaware. Without it, your CDL will include an “L” restriction banning you from driving vehicles equipped with air brakes, which are standard equipment on most semi-trucks and trailers. Our CDL Air Brakes Practice Tests are designed to prepare and help you confidently pass your exam on the first attempt.
Delaware’s coastal and wetland areas, particularly along the Delaware Bay and in areas like Cape Henlopen State Park, create situations where truck drivers face wet, slick, and flooded roads, making air brakes proficiency essential. The Delaware Memorial Bridge and the Chesapeake & Delaware Canal Bridge feature inclined grades that require air brake management for safe travel. Congested areas like Wilmington and Dover have heavy traffic where air brake qualifications are needed for precise stopping.
Industries across the First State rely on drivers with the air brake qualification. These include agriculture, manufacturing, financial services, tourism, and transportation and logistics. Key companies in the state, like Safer Trucking (Wilmington) and Delaware Motor Transport (Dover), require air-brake-qualified drivers for safe handling of freight. Charter bus companies like Delaware Express (Wilmington) and Beach Bus (Rehoboth Beach) require air brake qualifications. Most, if not all, school districts use air-brake-equipped school buses. Companies like Delaware Constructors and Brandywine Construction often require air-brake-qualified drivers to transport large equipment across the state. Simply put, the “L” restriction makes operating CMVs equipped with air brakes illegal, thus eliminating the above job prospects.
The official two-part DMV test covers the parts of an air brake system, effective operation, and air-brake inspection procedures. The skills test requires you to physically inspect an air brake system, identify its components, and operate a vehicle equipped with air brakes. This test includes checking air pressure, testing the brakes for leaks, and more. The multiple-choice written test requires a score of at least 80% to pass and features questions directly from material found in the state’s CDL manual.
Our CDL Air Brakes Practice Tests cover all that is required for the official DMV knowledge test and mimic the content and format you will face on the test. Our practice test questions and answers provide responses in real time so you can learn quickly and confidently pass your official exam!
- 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 DE DMV exam
questions
correct answers to pass
passing score
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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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:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly. - Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the DMV manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the DMV publishes them.
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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