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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 Kansas CDL knowledge test. The KS 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 Kansas CDL Manual. Take this KS CDL practice test now to prepare for the actual air brakes test!
1. Which of the following is a reason why air tanks must be drained?
Your transmission fluid may drain out.
The governor may stop the compressor from pumping air.
Your battery fluid may drain out.
Your brakes may fail due to the water freezing.
2. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
it is shaped like the letter "S".
"S" stands for "Shoes".
it is a safe-driving brake.
it applies a "Shock" to the brakes.
3. On any upgrade, gravity:
doesn't affect your speed.
slows you down.
speed you up.
doubles your speed.
4. Service brakes should:
only be checked by a mechanic.
be checked before each trip.
always be checked before applying the brakes.
All of the above.
5. If the drive wheels begin to spin when accelerating, you should:
brake gently.
take your foot off the accelerator.
continue to accelerate.
set the parking brake.
6. With the controlled braking method, you:
push down on the brake pedal as hard as you can so that the wheels the lock up.
apply the brakes as hard as you can without locking the wheels.
apply the brakes all the way and release brakes when the wheels the lock up.
None of the above.
7. If your trailer starts to skid, you should:
release the brakes to get traction back.
accelerate slightly.
keep the rear of your vehicle close to the curb.
use the trailer hand brake (if you have one) to straighten out the rig.
8. Supply pressure gauges tell drivers:
how much pressure the relay valves should send to the trailer brakes.
how much pressure is in the air tanks.
how much air pressure they are applying to the brakes.
All of the above.
9. In vehicles with air brakes, the brake pedal:
controls the air pressure applied to the brakes.
let the air out of the spring brakes.
tells you how much pressure is in the air tanks.
pumps air into the air storage tanks.
10. The parking brake:
should be used when driving in bad weather.
should be used whenever you park.
should be used when you need to apply the brakes firmly.
All of the above.
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KS Air Brakes Test

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