- Updated for January 2025
- Based on 2025 LA commercial driver's license manual
Free Louisiana CDL Air Brakes Test 2025
Louisiana is one of the best states in the nation for truck driving, with a robust amount of exports needed all over the country and internationally. As a Louisiana truck driver, the best way to support oneself is to have a license with the fewest amounts of restrictions and that means learning how to drive with air brakes. To get a CDL with an air brakes qualification, you should take practice exams early and often. Then on the day of the real exam, you will find that you’re incredibly comfortable with the questions already. This 30 multiple-choice question quiz, complete with hints and explanations, is closely based on the Louisiana Commercial Driver’s License Manual’s series of questions about air brakes, so take it as many times as you need to get a perfect score, and you’ll be on your way to driving with air brakes starting today!
- 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 LA OMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- Which of the following should you do before leaving your vehicle unattended?
- When should you use the parking brakes?
- How do brakes work on a long, steep downgrade?
- Under which conditions are front-wheel brakes good?
- The purpose of a supply pressure gauge is
- Which of the following are true about a dual air brake system?
- Which of the following can cause brakes to fade or fail?
- When should you drain your air tanks?
- Spring brakes are
- Slack adjusters are
- At what measurement is the safety valve USUALLY set to open?
- How do you check your truck's slack adjusters?
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- Which of the following is NOT part of the drum brake?
- An anti-lock braking system (ABS)
- Which vehicles must have low air pressure warning signals?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- If the air tanks are not drained,
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- After the initial drop, the maximum acceptable leakage rates per minute are
- 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?
- Why must you pass a knowledge test on air brakes?
- The tractor protection valve
- 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
- Alabama: Test 1 / Test 2
- Alaska: Test 1 / Test 2
- Arizona: Test 1 / Test 2
- Arkansas: Test 1 / Test 2
- California: Test 1 / Test 2
- Colorado: Test 1 / Test 2
- Connecticut: Test 1 / Test 2
- Delaware: Test 1 / Test 2
- District of Columbia: Test 1 / Test 2
- Florida: Test 1 / Test 2
- Georgia: Test 1 / Test 2
- Hawaii: Test 1 / Test 2
- Idaho: Test 1 / Test 2
- Illinois: Test 1 / Test 2
- Indiana: Test 1 / Test 2
- Iowa: Test 1 / Test 2
- Kansas: Test 1 / Test 2
- Kentucky: Test 1 / Test 2
- Louisiana: Test 1 / Test 2
- Maine: Test 1 / Test 2
- Maryland: Test 1 / Test 2
- Massachusetts: Test 1 / Test 2
- Michigan: Test 1 / Test 2
- Minnesota: Test 1 / Test 2
- Mississippi: Test 1 / Test 2
- Missouri: Test 1 / Test 2
- Montana: Test 1 / Test 2
- Nebraska: Test 1 / Test 2
- Nevada: Test 1 / Test 2
- New Hampshire: Test 1 / Test 2
- New Jersey: Test 1 / Test 2
- New Mexico: Test 1 / Test 2
- New York: Test 1 / Test 2
- North Carolina: Test 1 / Test 2
- North Dakota: Test 1 / Test 2
- Ohio: Test 1 / Test 2
- Oklahoma: Test 1 / Test 2
- Oregon: Test 1 / Test 2
- Pennsylvania: Test 1 / Test 2
- Rhode Island: Test 1 / Test 2
- South Carolina: Test 1 / Test 2
- South Dakota: Test 1 / Test 2
- Tennessee: Test 1 / Test 2
- Texas: Test 1 / Test 2
- Utah: Test 1 / Test 2
- Vermont: Test 1 / Test 2
- Virginia: Test 1 / Test 2
- Washington: Test 1 / Test 2
- West Virginia: Test 1 / Test 2
- Wisconsin: Test 1 / Test 2
- Wyoming: Test 1 / Test 2
Your go-to, trusted source
Experience the Driving-Tests differenceOur 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.
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.
Get your ELDT certificate and pass CDL exams the first time. Guaranteed.
Get full access to our 3-in-1 program, starting at $79. CDL schools charge $3,000-$4,000 for that.
All 1,500 LA exam-like questions
Pass Guarantee: pass your permit exam, or get your money back
ELDT certification included
Official FMCSA-approved provider, instant completion reporting
Industry-leading 99.06% success rate
Compare with the average US passing rate of 49%
Trusted by over 1.15 Million customers
The only program recommended by DMVs
