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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.
You supply air to the trailer brake system by:
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pulling out the trailer air supply valve.
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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2.
Supply pressure gauges tell drivers:
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how much air pressure they are applying to the brakes.
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how much pressure is in the air tanks.
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how much pressure the relay valves should send to the trailer brakes.
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All of the above.
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3.
If the low air pressure warning light comes on, you should:
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call for help.
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set the parking brake.
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stop immediately.
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continue to drive normally.
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4.
ABS:
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makes it easier to break.
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allows the wheels to lock up.
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helps you avoid wheel lock up.
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makes it easier to turn.
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5.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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35 psi
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50 psi
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150 psi
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6.
When you make a quick lane change, the crack-the-whip effect can:
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the trailer to swing wide to the left.
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make it harder to turn without skidding.
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improve your traction.
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turn the trailer over.
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7.
Vehicles with air brake systems take longer to come to a complete stop than vehicles with hydraulic brakes because of:
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brake lag.
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tire pressure.
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brake fading.
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reaction distance.
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8.
Front wheel braking is good:
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under all conditions.
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only in good weather.
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only in wet conditions.
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Never.
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9.
Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
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The letters "ABS" are printed on the side of the steering wheel.
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It has yellow ABS malfunction lamps.
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Wheel speed sensor wires are coming from the back of the brakes.
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It was built after March 1, 1998.
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10.
Which of the following is NOT part of the drum brake?
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Return spring
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Brake drum
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Safety valve
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Axle
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