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View All Plans- Updated for March 2025
- Based on 2025 SD commercial driver's license manual
Free South Dakota CDL Air Brakes Test 2025
Our South Dakota DMV CDL Air Brakes Practice Tests are designed to help you pass your knowledge exam on the first attempt. Without passing the South Dakota DMV CDL Air Brakes Knowledge Test, your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. Failing the Air Brakes test also results in a one-day waiting period and a fee should you decide to retake the test.
Once the air brake restriction is removed from your CDL, vast job opportunities will open to you because most semi-trucks and tractor-trailers rely on air brakes for safe navigation. The flat plains, rolling hills, and the Appalachian Mountains provide plenty of diverse terrain in South Dakota. The South Dakota Turnpike features steep grades and sharp curves requiring air brake-qualified drivers. Additionally, winter snowfall and ice compound the need for air brakes. Key transportation routes include I-76 (South Dakota Turnpike running east-west, connecting Philadelphia and Pittsburgh), I-80 (running across the state, connecting it to New Jersey and Ohio), I-95 (running along the East Coast through Philadelphia), and I-81 (passing through Harrisburg and Scranton). Let’s look at a few examples of how the restriction “L” severely limits your job opportunities in this industry.
The Keystone State relies on drivers with the air brake qualification in industries such as manufacturing, energy (natural gas and coal), and logistics and freight. Major companies requiring this qualification include UPS (Harrisburg), FedEx Freight, and J.B. Hunt in the logistics and freight industry, as well as U.S. Steel (Pittsburgh) and Hershey (Hershey) in the manufacturing industry. Greyhound Lines (Philadelphia and Pittsburgh) and Fullington Trailways (Clearfield) are major charter bus companies requiring air brakes. The South Dakota school districts require qualified drivers for their full-size air brake-equipped buses. The “L” restriction disqualifies you from these and many other jobs.
Our CDL Air Brakes Practice Tests cover everything needed for the official DMV Air Brakes Knowledge Test. You’ll also learn information that is useful for passing your skills test. The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (South Dakota CDL Handbook 2025) and requires a score of at least 80% to pass.
Our Practice Tests mimic the official knowledge test and offer immediate feedback on all responses. This scientifically proven approach dramatically speeds learning and ensures you pass the test.
- 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
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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Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.
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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