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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. If your ABS is not working:
you still have normal brake functions, and should drive and brake as you always have.
the drive wheels will begin to spin, and you should take your foot off the accelerator.
it will slow your truck to a halt and force you to pull over.
you should immediately bring your vehicle to a complete stop.
2. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
a thumping sound.
a mechanical vibration.
air escaping from the open valve.
the service line valve close.
3. Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary systems should be at least:
100 psi.
130 psi.
75 psi.
50 psi.
4. The posted speed limit:
may only be exceeded when driving in rural areas.
should only be exceeded when passing other vehicles.
should never be exceeded.
is only a suggestion.
5. Air brakes use ________ to make the brakes work.
compressed air
compressed oil
compressed gas cylinders
compressed gases
6. The use of air brakes on a steep downgrade is only a supplement to:
the use of the "controlled braking" method.
the braking effect of the engine.
the use of the parking brakes.
the use of the spring brakes.
7. If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
4 seconds
5 seconds
2 seconds
3 seconds
8. When a tire fails, you must:
get out and check all the tires after you have come to a stop.
stay off the brake.
hold the steering wheel firmly.
All of the above.
9. In air brake vehicles, the parking brake should be used:
when the spring brakes are on.
any time you park (with a few exceptions).
as little as possible.
to hold your speed while going downhill.
10. In a dual air brake system, if one air system is very low on pressure:
you should drive and brake as you always have.
the effect won't be noticeable for the first 50 miles.
either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
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FL Air Brakes CDL Test

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