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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.
The trailer hand valve should:
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be used in driving.
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never be used to test the trailer brakes.
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never be used for parking.
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All of the above.
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2.
The air storage tanks:
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are connected to the engine through gears or a v-belt.
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protects the tank and the rest of the system from too much pressure.
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stop the compressor from pumping air.
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are used to hold compressed air.
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3.
If are being followed closely, you should:
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increase your following distance.
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change lanes quickly.
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flash your brake lights.
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decrease your following distance.
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4.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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if there is too much pressure.
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at 30 psi.
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every 15 minutes.
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if there is too little pressure.
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5.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
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the trailer spring brakes to come on.
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the speed of your vehicle to increase.
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the trailer emergency brakes to come on.
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All of the above.
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6.
With air brake vehicles, you should use the parking brakes:
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as little as possible.
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only during the vehicle inspection test.
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whenever you leave the vehicle unattended.
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only if your vehicle is equipped with ABS.
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7.
The tire load rating is stated:
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inside the suspension system.
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on the side of each tire.
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on each axle.
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on the dashboard.
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8.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
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worn.
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tight.
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loose.
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cracked.
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9.
In a vehicle with a dual air brake system:
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each system has its own air tanks.
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both systems typically operate the regular brakes on the rear axle.
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one system supplies air to the trailer.
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All of the above.
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10.
To check slack adjusters on S-cam brakes, you should:
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check that the spring brakes come on automatically.
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press the brake pedal and listen for any strange noises.
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use gloves and pull hard on each slack adjuster you can reach.
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All of the above.
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