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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.
If your trucks has a high center of gravity, which of the following is true for curves?
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Reduce your speed to a crawl.
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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You should travel at the posted speed limit.
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None of the above.
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2.
In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
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should not be removed.
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should be added regularly.
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should be drained completely.
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None of the above.
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3.
Supply pressure gauges tell you:
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when the pressure in the system drops below 60 psi.
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when the air pressure in the tanks falls below 60 psi.
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how much air pressure you are applying to the brakes.
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how much pressure is in the air tanks.
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4.
When confronted by an aggressive driver, you should:
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call the police, if you have a cell phone and can do it safely.
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avoid eye contact.
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make every attempt to get out of their way.
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All of the above.
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5.
Emergency brakes must be held on by:
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hydraulic pressure.
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dynamic pressure.
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mechanical force.
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air pressure.
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6.
In air-operated disc brakes, the pressure of the ______ on the ______ turns a "power screw".
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brake camshaft; tie rod
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slack adjuster; cam roller
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slack adjuster; tie rod
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brake chamber; slack adjuster
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7.
The parking or emergency brakes of trucks or buses must be held on by:
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spring pressure.
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fluid pressure.
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air pressure.
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hydraulic pressure.
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8.
When you push the brake pedal down, air brakes work:
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only when ABS is working.
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after a short delay.
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immediately.
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after about 15 seconds.
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9.
A dual air brake system:
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has two separate air brake systems, which use a single set of brake controls.
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has a single air brake system, which uses two separate sets of brake controls.
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has two separate air brake systems, which use two separate sets of brake controls.
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has a single air brake system, which uses a single set of brake controls.
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10.
If air pressure does not build up fast enough:
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the pressure may drop too low during driving.
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you may be forced to turn off the engine and release the parking brake.
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you should turn the electrical power on and step on and off the brake pedal.
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you should put the parking brake on and gently pull against it in a low gear.
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Frequently Asked Questions
- Teens under 18 must follow the three steps of the Graduated Licensing Program to obtain a class D driver's license. To apply for a permit, you must be 16 years old. If you are under 21, after holding your permit for 6 months and completing a minimum of practice driving hours, you are eligible for an intermediate license. After holding the intermediate license for 6 months, you are ready for the full unrestricted license.
- If you are over 18, you can apply for a permit, and after 6 months, you will be eligible for a full-unrestricted license.
- If you are over 21, you only need to hold the permit for 30 days before applying for a full-unrestricted license.
You can schedule an appointment online for your DMV written test at the Kentucky State Police website. Locate the Kentucky driver licensing office nearest to you and check its operating hours and available days.
When applying for the first time, you need to bring specific documents:
- One proof of identity, such as a birth certificate or passport, and an additional document if you have changed your name (marriage certificate, legal name change order).
- One proof of Social Security number, such as an SS Card.
- One proof of residency, such as a utility bill, telephone bill, or bank statement.
- School Compliance Verification Form (for minors).
Use this tool to generate a personalized list of documents.
DMV written tests are available in Albanian, Kinyarwanda, Arabic, Korean, Bosnian, Laotian, Burmese, Pashto, Cambodian, Polish, Chinese, Romanian, Croatian, Russian, Dari, Somali, Farsi, Spanish, French, Swahili, German, Thai, Hindi, Turkish, Japanese, and Vietnamese. If you are unable to read English, you can opt for an oral exam. If you are deaf or hearing impaired, please contact a driver licensing office and request an interpreter.
To pass the DMV written test, study the Kentucky Driver's Manual. Pay attention to road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. Practice with our free tests or choose DMV Premium for additional resources!
Restrictions vary according to your age and license type. If you have a permit license:
- You can drive only under the supervision of a licensed driver aged 21 or older in the front passenger seat.
- You cannot transport more than one passenger under 20 (except for family members).
- You cannot drive between 12:00 a.m. and 6:00 a.m., except for emergencies, school, or work activities.
- Under 21 there is a "Zero Alcohol Tolerance" for those under 21.
If you have an intermediate license, the same driving hours, passenger, and alcohol restrictions apply, but you can drive alone during daylight hours.
The Kentucky instruction permit is valid for three years and can be renewed in person. Appointments are highly recommended because walk-in availability varies at different locations. If the permit is not renewed within one year of its expiration date, both the written and vision tests must be retaken.
If you do not pass your DMV written test in Kentucky, you can retake the test the following day. It is advisable to dedicate time to preparing adequately for the exam to enhance your chances of success.