Arizona CDL Air Brake Test (AZ) 2026

4.9 out of 5 (71 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Getting ready for your commercial driver's license in Arizona? Our AZ CDL air brakes practice test is designed to provide you with a thorough understanding of air brake systems. This test comprises 20 multiple-choice questions that cover everything from compressors and reservoirs to brake chambers and safety protocols. You'll also find questions about the unique brake lag time in air brakes, a crucial factor for calculating stopping distances accurately. By correctly answering at least 16 questions, you'll ensure you're well-prepared for your Arizona air brakes CDL test. This AZ drivers permit practice test focuses on the specific rules, regulations, and road signs that are unique to Arizona, providing you with a tailored and relevant learning experience. As driving laws can vary from state to state, our test ensures you're getting the most accurate and applicable information for AZ. Unlike unreliable and potentially illegal "cheat sheets," our Arizona permit practice test offers a reliable and effective way to study. This DMV practice test is not only legal but has a verified track record of helping drivers succeed. By taking this AZ permit test practice multiple times, you can identify and eliminate any gaps in your knowledge, ensuring a better performance on the actual test day. Using our Arizona CDL air brakes practice test, you can confidently prepare for your air brakes endorsement. This comprehensive test is a trusted study tool that ensures you master the fundamentals of air brake operation, focusing on safety and effectiveness. Don't rely on shortcuts; invest your time in a method that has been proven to work and prepare yourself thoroughly for the AZ DMV air brake test.
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Sample Arizona Air Brakes Test Questions

Question 1

What indicates that a tractor, truck, or bus is equipped with ABS?

  1. A A red ABS malfunction lamp on the instrument panel
  2. B A yellow ABS malfunction lamp on the instrument panel
  3. C A red ABS lamp on the vehicle’s left exterior
  4. D A red ABS lamp on the vehicle’s right exterior

Correct answer: B – A yellow ABS malfunction lamp on the instrument panel

The Arizona air-brake section identifies a yellow ABS malfunction lamp on the instrument panel of tractors, trucks, and buses. On newer vehicles, it illuminates briefly during the startup bulb check and then goes out. A lamp that remains illuminated can indicate that the ABS is not operating correctly.

Source: Arizona Commercial Driver License Manual — § 5.2.3, “How to Know If Your Vehicle Is Equipped with ABS”

Question 2

Under good conditions, an air-brake vehicle traveling at 55 mph can stop in about 100 feet.

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

At 55 mph, the manual estimates that air-brake lag alone adds about 32 feet. For an average driver on dry pavement with good traction and properly operating brakes, total stopping distance is more than 450 feet. A distance of 100 feet accounts for only a small portion of the space needed.

Source: Arizona Commercial Driver License Manual — § 5.4.4, “Stopping Distance”

Question 3

With the engine off and the brakes released, a combination vehicle should lose less than how many psi in one minute?

  1. A 4 psi
  2. B 3 psi
  3. C 2 psi
  4. D 1 psi

Correct answer: B – 3 psi

Arizona’s CDL manual states that a combination vehicle should lose less than 3 psi in one minute during the released-brake leakage test. The test begins with a fully charged system, the engine off, and the parking brakes released. Excessive pressure loss indicates an air leak that must be corrected before driving.

Source: Arizona Commercial Driver License Manual — § 5.3.3, “Step 7: Final Air Brake Check”

Question 4

The supply pressure gauge is used to determine how soon an S-cam will rotate.

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

A supply pressure gauge displays the amount of air pressure in the vehicle’s air tanks. A dual air-brake system has a gauge for each half of the system or one gauge with two needles. The gauge does not measure or time the movement of an S-cam.

Source: Arizona Commercial Driver License Manual — § 5.1.9, “Supply Pressure Gauges”

Question 5

During normal driving, what holds spring parking and emergency brakes in the released position?

  1. A Air pressure
  2. B Spring pressure
  3. C Centrifugal force
  4. D Gravity

Correct answer: A – Air pressure

During normal operation, air pressure holds the powerful spring-brake springs back. When air pressure is released or lost, the springs apply the brakes mechanically. This design allows the spring brakes to function as parking brakes and as part of the emergency-braking system.

Source: Arizona Commercial Driver License Manual — § 5.1.14, “Spring Brakes”

Question 6

On a vehicle without ABS, which procedure describes stab braking during an emergency stop?

  1. A Apply the foot brake and hand valve continuously until stopped
  2. B Lock the wheels, then release the brakes for the same amount of time
  3. C Apply the brakes fully, release them when the wheels lock, and reapply when the wheels roll again
  4. D Pump the brake pedal rapidly with light pressure

Correct answer: C – Apply the brakes fully, release them when the wheels lock, and reapply when the wheels roll again

Stab braking involves applying the brakes fully and releasing them when the wheels lock. Wait until the wheels begin rolling again, then apply the brakes fully once more. Reapplying before the wheels roll can prevent the vehicle from straightening out; vehicles with functioning ABS should be braked according to ABS procedures.

Source: Arizona Commercial Driver License Manual — § 5.4.3, “Emergency Stops”

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