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View All PlansBefore you can drive Louisiana’s air brake-equipped vehicles on major roads like I-10 or U.S. 61, you’ll need to pass the OMV Air Brakes Knowledge Test as well as the Skills Test in an air brake-equipped vehicle. These tests confirm you understand how to safely operate air brake-equipped rigs; passing both will result in the removal of the “L” restriction from your CDL. Until that restriction is removed, you cannot legally operate vehicles with air brakes, and your driving career will be significantly hampered.
The Louisiana Air Brakes Knowledge Test includes 25 multiple-choice questions, and you must score at least 80% (16 correct answers) to pass. A waiting period of one business day and a retest fee will result if you miss more than four questions. Our series of Louisiana-specific Air Brakes Practice Tests helps ensure you’ll face no additional wait times or fees, and you’ll pass your official exam on the first attempt.
Our Louisiana Air Brakes Practice Tests mirror the official exam, offering immediate feedback, helpful hints, and AI-driven explanations. You’ll also find an interactive CDL Manual as well as our Challenge Bank, which remembers any missed questions and presents them again until you answer correctly. These scientifically proven tools are extraordinary in their ability to increase retention and speed the learning process. Check out another one of our Air Brakes Practice Tests: https://driving-tests.org/louisiana/la-cdl-air-brake-practice-test/.
Earning the Air Brake qualification isn’t about pride; it’s about better pay and more opportunity and is almost a necessity for a commercial driving career. Louisiana’s highways, like I-10, U.S. 90, and Highway 1, provide the infrastructure needed for air brake-equipped drivers to keep the state’s economy moving. The Bayou State’s major industries, such as oil and gas, petrochemicals, agriculture (sugarcane, soybeans, cotton, seafood), and port logistics, depend heavily on air brake-qualified CDL holders.
Because most combination vehicles use air brakes, you should also consider passing the CDL Combination Vehicles Knowledge Test, which is one of the key requirements for obtaining a Class A CDL. We have more information and practice tests for that endeavor here: https://driving-tests.org/louisiana/la-cdl-combination-test/. You can also increase your earning potential with endorsements like T – Doubles/Triples, N – Tanker, and H – Hazardous Materials. Each endorsement requires an additional knowledge test, and we have just what you need to prepare and pass those on your first attempt: https://driving-tests.org/louisiana/la-cdl-hazmat-practice-test/.
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Chief Educational Researcher, Driving‑Tests.org (ACES member)
Verified for accuracy November 2025
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