Florida CDL Practice Test — General Knowledge, Air Brakes & Endorsements (2026)
Florida's Commercial Driver License program includes knowledge tests covering federal transportation regulations, vehicle control, and safety procedures. The CDL license costs $75, and endorsements cost $7 each. Endorsements available include HazMat, Tanker, Passenger, Doubles/Triples, School Bus, and Air Brakes. CDL applicants must be at least 21 years old.
Sample Florida CDL Practice Test Questions & Official Manual Citations (2026)
Below are 4 real sample questions from our Florida cdl practice test bank. Every question in PassMyDMV cites the exact page and rule in the official Florida manual so you understand the law behind every answer:
Sample Question 1 · Air Brake Systems
Official Florida Manual · Chapter 13 · Page 79
What are the three different braking systems in air brake systems?
- A. Primary brake, secondary brake, and backup brake
- B. Front brake, rear brake, and auxiliary brake
- C. Service brake, parking brake, and emergency brake Correct
- D. Mechanical brake, hydraulic brake, and pneumatic brake
Why C. Service brake, parking brake, and emergency brake is correct: Air brakes are composed of three different braking systems: the service brake system applies and releases brakes during normal driving; the parking brake system applies and releases brakes when you use the parking brake control; and the emergency brake system uses parts of the service and parking brake systems to stop the vehicle in case of brake system failure. [Manual: Air Brakes — Air Brake System Parts, p. 79]
Manual excerpt (Official Florida Manual · Chapter 13 · Page 79): “Air brakes are really three different braking systems: service brake, parking brake, and emergency brake.”
Sample Question 2 · Air Compressor Governor
Official Florida Manual · Chapter 13 · Page 79
At what air pressure does the governor stop the compressor from pumping air into the storage tanks?
- A. Around 80 psi
- B. Around 100 psi
- C. Around 150 psi
- D. Around 125 psi Correct
Why D. Around 125 psi is correct: The governor controls when the air compressor pumps air. When air tank pressure rises to the 'cut-out' level, which is around 125 psi (pounds per square inch), the governor stops the compressor from pumping air. This protects the system from overpressurization. [Manual: Air Brakes — Air Compressor Governor, p. 79]
Manual excerpt (Official Florida Manual · Chapter 13 · Page 79): “When air tank pressure rises to the 'cut-out' level (around 125 pounds per-square-inch or 'psi'), the governor stops the compressor from pumping air.”
Sample Question 3 · Air Tank Maintenance
Official Florida Manual · Chapter 13 · Page 79
Why must air tanks be drained?
- A. To remove water and compressor oil that can damage the brake system Correct
- B. To prevent the tanks from becoming too pressurized
- C. To reduce the weight of the vehicle
- D. To keep the air fresh for better braking performance
Why A. To remove water and compressor oil that can damage the brake system is correct: Compressed air usually contains water and compressor oil, which is harmful to the air brake system. Water can freeze in cold weather and cause brake failure. Both water and oil tend to collect in the bottom of the air tank, which is why the tanks must be drained completely at the end of each day of driving. [Manual: Air Brakes — Air Tank Drains, p. 79]
Manual excerpt (Official Florida Manual · Chapter 13 · Page 79): “Compressed air usually has some water and some compressor oil in it, which is bad for the air brake system. For example, the water can freeze in cold weather and cause brake failure.”
Sample Question 4 · Alcohol Evaporator
Official Florida Manual · Chapter 13 · Page 79
What is the purpose of an alcohol evaporator in an air brake system?
- A. To increase air pressure in the storage tanks
- B. To improve the performance of the air compressor
- C. To clean the compressed air before it enters the brake system
- D. To reduce the risk of ice in air brake valves and other parts during cold weather Correct
Why D. To reduce the risk of ice in air brake valves and other parts during cold weather is correct: Some air brake systems have an alcohol evaporator to put alcohol into the air system. This helps reduce the risk of ice in air brake valves and other parts during cold weather. Ice inside the system can make the brakes stop working. The alcohol container must be checked and filled as necessary, especially every day during cold weather. [Manual: Air Brakes — Alcohol Evaporator, p. 79]
Manual excerpt (Official Florida Manual · Chapter 13 · Page 79): “Some air brake systems have an alcohol evaporator to put alcohol into the air system. This helps to reduce the risk of ice in air brake valves and other parts during cold weather.”
Most-Tested Florida CDL Practice Test Topics in Our 551-Question Bank
Our Florida cdl practice test bank contains 551 active multiple-choice questions written directly from the official Florida handbook. Here is how those questions break down across the core exam topics:
Frequently Asked Questions: Florida CDL Practice Test
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