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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Florida CDL knowledge test. The FL CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Florida CDL Manual. Take this FL CDL practice test now to prepare for the actual air brakes test!
1. The total stopping distance for vehicles with air brake systems is made up of __ different factors.
2. If you are being tailgated, you should:
try to let the other vehicle pass.
drive on the shoulder.
turn on your taillights.
speed up.
3. To prevent rollover, you should:
place the cargo near the rear of the trailer.
place the cargo near the front of the trailer.
keep the cargo as close to the ground as possible.
put the lightest parts of the cargo under the heaviest parts.
4. Foundation brakes are used:
only with the rear wheels.
at each wheel.
only with the right wheels.
only with the front wheels.
5. To check the slack adjusters on S-cam brakes, you should:
park on level ground, chock the wheels and release the parking brakes, then use gloves and pull hard on each slack adjuster that you can reach.
park on level ground and fan off the air pressure by rapidly applying and releasing the foot brake.
release the parking brake valve and begin reducing the air pressure by stepping on and off the brake pedal.
All of the above.
6. After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
shutting the engine off so you can hear the brakes.
checking the air brake system pressure gauge for signs of major air loss.
All of the above.
7. To check that spring brakes come on automatically, the first thing to do is to:
turn off the engine, release the parking brake and time the air pressure drop.
release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
All of the above.
8. An ABS system:
gives you more control over the vehicle during braking.
keep your wheels from locking when you brake hard.
helps you avoid skids caused by over braking.
All of the above.
9. Some vehicles have a separate air tank which can be used to:
hold the vehicle or combination of vehicles stationary.
unload cargo or passengers.
turn on the 4-way emergency flashers.
release the spring brakes.
10. ABS:
improves your visibility at night.
may cause your wheels to lock when you break hard.
helps you avoid skids caused by over braking.
helps you stop faster.
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FL CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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