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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. When should you downshift automatic transmissions?
When you start to get drowsy.
When going down steep grades.
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you want to go faster.
2. After starting the engine, oil pressure should rise to a normal level:
within 2 minutes.
within 3 miles.
within 6 minutes.
within seconds.
3. If you get stuck on railroad tracks, you should:
stay in the vehicle and call for help.
get out of the vehicle and away from the tracks.
have a helper push your vehicle.
check the engine compartment quickly.
4. With the air pressure built up to governor cutoff, the maximum leakage rates per minute after the initial pressure drop are:
5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
1 psi for single vehicles and 2 psi for a combination of 2 vehicles.
3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
4 psi for single vehicles and 2 psi for a combination of 2 vehicles.
5. When you use your mirrors while driving on the road, you should:
avoid checking them regularly.
only use the driver's side mirror.
check them quickly.
stare for a long time at the mirror.
6. If the spring brakes do not release when you push the trailer air supply control, you should:
pump the brakes.
check the air line connections.
rev or lug the engine.
check the electrical cables.
7. In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
should be drained completely.
should not be removed.
should be added regularly.
None of the above.
8. Antilock brakes:
let you drive faster.
help you stop faster.
decrease your stopping distance.
None of the above.
9. How many reflective triangles/emergency reflectors should you carry?
10. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
left; right
left; left
right; left
right; right
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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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