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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. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
left; left
left; right
right; left
2. If the ABS is not working:
you still have normal brake functions.
the vehicle will have weak brakes.
the vehicle will have no brakes.
3. Before starting down a hill, you should:
slow down and shift to a lower gear.
look for an escape route.
release the accelerator and shift to Neutral at the same time.
4. Air pressure should build up in a single air system, within about:
15 minutes.
10 minutes.
3 minutes.
5. Your vehicle has a dual air brake system. If one air system is very low on pressure, you should:
call your dispatcher or supervisor for instructions.
reduce your speed and check the low air pressure warning signal for the other system regularly.
bring the vehicle to a safe stop, and have the air brakes system fixed.
6. When the air system is fully-charged, the air loss rate for a single vehicle with the engine off should be less than:
3 psi in one minute.
2 psi in 30 seconds.
2 psi in one minute.
7. You should always try to back toward the driver's side because:
backing toward the left side is more dangerous.
you can watch the rear of your vehicle out the side window.
None of the above.
8. When should you downshift automatic transmissions?
When going down steep grades.
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you start to get drowsy.
9. Dual tires:
should always come in contact with each other.
should come in contact with each other whenever possible.
should not come in contact with each other.
10. The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.
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AZ Air Brakes Test

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