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View All Plans- Updated for May 2025
- Based on 2025 FL commercial driver's license manual
Free Florida CDL Air Brakes Test 2025
Planning to drive commercial motor vehicles (CMVs) with air brakes? Our Florida DMV CDL Air Brakes Practice Tests are designed to prepare you for success, helping you confidently pass your knowledge exam on the first attempt. Without passing, your CDL will include the restriction “L,” preventing you from operating CMVs with air brakes. In Florida, where traffic congestion, hurricanes, and heat affect road conditions, air brake proficiency ensures safe and reliable performance. As most semi-trucks and tractor-trailers rely on air brakes, this endorsement is essential.
Industries across the Sunshine State rely on drivers with the air brake qualification. Key industries include tourism (beaches, theme parks, Miami), agriculture (citrus, sugarcane, tomatoes), aerospace (Cape Canaveral), construction (especially in growing metropolitan areas), and logistics (ports, especially Miami and Jacksonville). Key companies requiring the air brakes qualification include trucking companies like XPO Logistics (Miami). Utility companies with operations across the state, like Florida Power & Light (Miami), transport heavy equipment and materials in vehicles with air brakes. Charter bus companies like Greyhound Lines (Miami, Orlando) and Florida Tours (Orlando) use air brakes, as do school buses across all districts in Florida. {state name}’s large agriculture industry, particularly citrus production, requires air-brake-qualified drivers to transport crops, including to and from packing plants and warehouses. The state’s construction industry, especially in urban growth areas like Miami and Orlando, often requires drivers to operate large vehicles with air brakes to transport heavy equipment. Simply put, the “L” restriction makes operating CMVs equipped with air brakes illegal, making the above-listed job prospects unattainable.
The official two-part DMV test ensures you’re proficient in air brake systems, effective operation, and air-brake inspection procedures. The hands-on skills test includes inspecting components, testing for air pressure and leaks, and operating a vehicle equipped with air brakes. The written portion features multiple-choice questions based on the state’s CDL manual and requires a score of at least 80% to pass.
Our CDL Air Brakes Practice Tests consider everything required for the official DMV knowledge test and mimic the content and format you will face on the test. Additionally, our practice test questions and answers provide responses in real time, which is a scientifically proven method for improving material retention so you can learn quickly and be confident of passing 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 FL DMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- How would you check your truck's slack adjusters?
- What is the best way to test your vehicle's low air pressure warning signal?
- If the air tanks are not drained,
- In Florida, why must you pass a knowledge test on air brakes?
- 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?
- At what measurement is the safety valve USUALLY set to open?
- When should you drain your air tanks?
- Which of the following is NOT part of the air brake system?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which of the following can cause brakes to fade or fail?
- Spring brakes are
- How can you tell if your vehicle is equipped with an antilock braking system (ABS)?
- Slack adjusters are
- When should you use the parking brake?
- The tractor protection valve
- The purpose of a supply pressure gauge is
- After the initial drop, the maximum acceptable leakage rates per minute are
- An antilock braking system (ABS)
- Under which conditions are front wheel brakes good?
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following is NOT part of the drum brake?
- How do brakes work on a long, steep downgrade?
- 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)?
- Which vehicles must have low air pressure warning signals?
- 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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