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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 most common type of brake is the:
B-cam disc brake
S-cam drum brake
G-cam disc brake
R-cam drum brake
2. Front-end header boards:
reduce traction.
protect drivers from spilled cargo.
protect drivers from cargo in case of an accident or emergency stop.
should never be used.
3. Rough acceleration:
can cause mechanical damage.
improves gas mileage.
is recommended during long trips.
is necessary to warm up the engine.
4. Excessive use of the service brakes results in overheating and leads to:
low air pressure.
brake fade.
poor traction.
reduction of the brake drums.
5. To prevent drowsiness you should:
schedule trips for the middle of the night.
get adequate sleep before a trip.
avoid exercise to save more energy.
never drive with a passenger.
6. In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
7. In newer vehicles with air brakes, you put on the parking brake:
using a P-shaped, yellow control knob.
moving the orange push-pull lever to the right.
using a diamond-shaped, yellow, push-pull control knob.
placing the transmission in Park.
8. When you make a quick lane change, the crack-the-whip effect can:
turn the trailer over.
the trailer to swing wide to the left.
improve your traction.
make it harder to turn without skidding.
9. What factors can cause brakes to fade?
Dirt roads and in unpaved yards.
Gravel and tar.
Slippery surfaces and shaded areas.
Excessive heat and brakes out of adjustment.
10. If you must drive slowly, how should you alert following drivers?
Help them out by signaling when it is safe to pass
Turn on your taillights
Flash your brake lights
Use your emergency flashers if it is legal
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KS CDL Air Brakes Test

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