- Updated for March 2025
- Based on 2025 MS commercial driver's license manual
Free Mississippi CDL Air Brakes Test 2025
Failure to pass the Mississippi DMV CDL Air Brakes Knowledge Test will prevent you from operating commercial motor vehicles (CMVs) with air brakes because restriction “L” will remain on your CDL. The “L” restriction can significantly damage your job prospects in commercial driving, as air brakes are commonly employed across the transportation sector. Failing the air brakes test in Mississippi results in a one-day waiting period and a fee should you decide to retake the test. Our Mississippi DMV CDL Air Brakes Practice Tests will help you pass your knowledge exam on the first attempt.
Because most semi-trucks, tractor-trailers, and commercial buses rely on air brakes for safe navigation, removing the air brake restriction from your CDL is vital for expanded job opportunities. Key transportation routes within Mississippi include I-20 (an east-west corridor between Louisiana and Alabama), I-55 (a major north-south route connecting with Arkansas and Louisiana), I-10 (connecting Mississippi to New Orleans and the Gulf Coast), and US-49 (running from the Delta region to southern Mississippi). Mississippi features both flat terrain and the Appalachian foothills. Frequent heavy rainfall and occasional flooding impact road conditions, making air brakes essential for safe vehicle control. These hazards are compounded by winter ice and frost.
The Magnolia State relies on air brakes in key industries, including agriculture, energy, manufacturing, and logistics. CDL drivers with air brake qualifications are in demand in companies like Sanderson Farms and Cal-Maine Foods in the agriculture sector and Entergy Mississippi in the energy sector. Peavey Electronics (Meridian) and Nissan (Canton) require air brake-qualified drivers in the manufacturing industry and FedEx Freight and XPO Logistics in the logistics and freight services. The charter bus industry includes air brake-equipped buses at Greyhound Lines and Shoreline Tours. Full-size school buses used throughout the state typically have air brakes too. The “L” restriction closes access to these jobs.
The information you learn from practicing with our CDL Air Brakes Practice Tests will fully prepare you for the official DMV Air Brakes Knowledge Test and help you pass your skills test. The knowledge test features multiple-choice questions based on the state’s CDL manual (Mississippi CDL Handbook 2025) and requires a minimum passing score of 80%.
Our tests mimic the official knowledge test, and you’ll receive immediate feedback on all your Practice Test responses. This approach speeds learning and ensures you pass the knowledge 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 MS DMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- Which of the following is NOT part of the air brake system?
- When should you drain your air tanks?
- Which of the following are true about a dual air brake system?
- Slack adjusters are
- What is the best way to test your vehicle's low air pressure warning signal?
- 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)?
- Spring brakes are
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- How do brakes work on a long, steep downgrade?
- At what measurement is the safety valve USUALLY set to open?
- The tractor protection valve
- An anti-lock braking system (ABS)
- Which of the following is NOT part of the drum brake?
- After the initial drop, the maximum acceptable leakage rates per minute are
- Under which conditions are front wheel brakes good?
- Which vehicles must have low air pressure warning signals?
- Which of the following can cause brakes to fade or fail?
- How would you check your truck's slack adjusters?
- The purpose of a supply pressure gauge is
- Which of the following should you do before leaving your vehicle unattended?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- If the air tanks are not drained,
- Why must you pass a knowledge test on air brakes?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- When should you use the parking brake?
- 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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