AIR BRAKES CDL PRACTICE TEST - KENTUCKY
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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 Kentucky CDL knowledge test. The KY 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 Kentucky CDL Manual. Take this KY CDL practice test now to prepare for the actual air brakes test!
1.
Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
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monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
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use only the braking force necessary to stop safely.
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drive slower to keep your vehicle in a straight line.
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brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
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2.
If your ABS fails:
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your tires might grab unexpectedly and you could lose control.
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you will still have normal brake functions.
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you will have no brake function, and could lose control.
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the first step is to get the vehicle off the road and stop.
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3.
The supply pressure gauges tell you how much air pressure:
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is in the air brakes.
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is in the air tanks.
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is going to the brake chambers.
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you are applying to the brakes.
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4.
With a fully-charged air system, the leakage rates should be less than:
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3 psi for single vehicles and 4 psi for a combination of two vehicles.
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5 psi for single vehicles and 10 psi for a combination of two vehicles.
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5 psi for single vehicles and 4 psi for a combination of two vehicles.
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2 psi for single vehicles and 3 psi for a combination of two vehicles.
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5.
You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
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The brake pedal feels spongy or goes to the floor.
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You hear a loud "bang".
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You have to apply your brakes harder and harder to get the same stopping power.
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The steering feels heavy.
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