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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.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
hold compressed air.
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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keep from rolling back.
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2.
A passive railroad crossing is one that:
does not have any type of traffic control device.
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has a traffic control device installed at the crossing to regulate traffic.
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requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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has at least two traffic control devices installed at the crossing to regulate traffic.
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3.
To avoid becoming a distracted driver you should:
adjust all vehicle controls and mirrors while driving.
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not engage in complex conversations with others.
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eat and drink while you drive.
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not turn off all communication devices.
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4.
When the spring brakes are on, you should push the brake pedal down:
Never.
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Only when driving downhill.
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Only when driving uphill.
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Only when approaching railroad-highway crossings.
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5.
The air brake lag distance at 55 mph on dry pavement adds about:
75 feet.
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60 feet.
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16 feet.
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32 feet.
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6.
Which of the following is NOT part of the air brake system?
Anti-lock brake system
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Parking brake system
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Service brake system
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Emergency brake system
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7.
The air compressor is connected to:
the suspension system.
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the engine.
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the radiator.
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the transmission.
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8.
To prevent drowsiness you should:
never drive with a passenger.
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get adequate sleep before a trip.
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avoid exercise to save more energy.
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schedule trips for the middle of the night.
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9.
A low air pressure warning signal:
is optional on vehicles with air brakes.
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is required on all vehicles without air brakes.
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is required on vehicles with air brakes.
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None of the above.
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10.
How do you check that spring brakes come on automatically?
On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out.
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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