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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. If you are being tailgated, you should:
speed up.
move to the left lane.
increase your following distance.
2. The air compressor is connected to:
the radiator.
the transmission.
the engine.
3. Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
reduces the risk of ice in air brake valves during cold weather.
helps you avoid wheel lock up.
helps keep the engine cool, as well as lubricating it.
4. Air storage tanks:
hold compressed air for the brakes.
use parts of the service brake systems to stop the vehicle in a brake system failure.
pump air into the air storage tanks.
5. Front brake limiting valves were used to:
prevent overheating of the front tires.
reduce the chance of the front wheels skidding on slippery surfaces.
reduce your speed so further braking or shifting is not required.
6. What is the best way to test the low air pressure warning signal?
Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
pump the brakes until the air pressure drops below 45 psi.
step on and off the brake pedal while the engine is running.
7. Brakes out of adjustment can cause the other brakes to:
apply more braking power.
overheat and fade.
last longer.
8. If you are being tailgated, you should:
try to let the other vehicle pass.
drive on the shoulder.
speed up.
9. The heavier the vehicle:
the higher the center of gravity will be.
the less work the brakes must do to stop it.
the more work the brakes must do to stop it.
10. A tank endorsement is:
only required when transporting gases.
required for both liquids and gases.
only required when transporting liquids.
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AZ CDL Air Brakes Test

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