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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 Arizona CDL knowledge test. The AZ 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 Arizona CDL Manual. Take this AZ CDL practice test now to prepare for the actual air brakes test!
1. Excessive use of the service brakes results in overheating. Too much heat can:
cause the brakes apply unevenly.
cause the brakes to grab.
make the brakes stop working.
2. An ABS system:
helps you avoid skids caused by over braking.
gives you more control over the vehicle during braking.
All of the above.
3. If an aggressive driver is involved in an accident down the road, you should:
confront the aggressive driver.
try to get their vehicle to the side of the road.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
4. To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
If you don't pass the air brakes test, you can't get a CDL.
All trucks have air brakes.
If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
5. In newer vehicles with air brakes, you put on the parking brake:
using a diamond-shaped, yellow, push-pull control knob.
using a P-shaped, yellow control knob.
placing the transmission in Park.
6. If you must drive slowly, how should you alert following drivers?
Turn on your taillights
Use your emergency flashers if it is legal
Flash your brake lights
7. The spring brakes come on:
when air pressure in both air brake systems rises to a value set by the manufacturer.
when main air pressure is lost.
when you bring the vehicle to a complete stop right away.
8. To test the low pressure warning signal, you should:
pump the brakes while your vehicle is running.
shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
check the air hoses connected to the brake chambers to make sure they aren't cut.
9. The low pressure warning signal will generally activate when the air pressure falls between:
80–85 psi.
55–75 psi.
85–100 psi.
10. To perform an applied leakage test, the vehicle’s air pressure should be built up to maximum pressure. Check the air gauge to see that the air pressure should drop no more than:
1 psi for single vehicles and 3 psi for a combination of 2 vehicles.
3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
2 psi for single vehicles and 5 psi for a combination of 2 vehicles.
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AZ CDL Air Brakes Test

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