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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?
Reduce your speed to a crawl.
You should slow down, as your truck can roll over at the posted speed limit for the curve.
You should travel at the posted speed limit.
None of the above.
2. In vehicles with air brakes, water and compressor oil in the bottom of the air tank:
should not be removed.
should be added regularly.
should be drained completely.
None of the above.
3. Supply pressure gauges tell you:
when the pressure in the system drops below 60 psi.
when the air pressure in the tanks falls below 60 psi.
how much air pressure you are applying to the brakes.
how much pressure is in the air tanks.
4. When confronted by an aggressive driver, you should:
call the police, if you have a cell phone and can do it safely.
avoid eye contact.
make every attempt to get out of their way.
All of the above.
5. Emergency brakes must be held on by:
hydraulic pressure.
dynamic pressure.
mechanical force.
air pressure.
6. In air-operated disc brakes, the pressure of the ______ on the ______ turns a "power screw".
brake camshaft; tie rod
slack adjuster; cam roller
slack adjuster; tie rod
brake chamber; slack adjuster
7. The parking or emergency brakes of trucks or buses must be held on by:
spring pressure.
fluid pressure.
air pressure.
hydraulic pressure.
8. When you push the brake pedal down, air brakes work:
only when ABS is working.
after a short delay.
after about 15 seconds.
9. A dual air brake system:
has two separate air brake systems, which use a single set of brake controls.
has a single air brake system, which uses two separate sets of brake controls.
has two separate air brake systems, which use two separate sets of brake controls.
has a single air brake system, which uses a single set of brake controls.
10. If air pressure does not build up fast enough:
the pressure may drop too low during driving.
you may be forced to turn off the engine and release the parking brake.
you should turn the electrical power on and step on and off the brake pedal.
you should put the parking brake on and gently pull against it in a low gear.
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KY CDL Air Brakes Test

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