Based on 2025 FL commercial driver's license manual
Free Florida CDL Air Brakes Test 2025
Today, you will have a chance to review your knowledge of air brakes by taking a practice exam closely based on the information found in the Florida CDL Manual. We have included 30 multiple-choice questions, which each have a hint and an explanation. Make sure that you read each explanation so that you have the maximum information about the topic, and practice as often as you need to feel confident that you will pass the real DMV exam. Good luck now and on your DMV air brake exam, practice well, and drive safely!
Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
Triple-checked for accuracy
What you need to know
9 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
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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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Written by Andrei ZakhareuskiUpdated over a week ago
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