Arizona CDL Air Brakes Practice Test (AZ) 2

5 out of 5 (52 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready for your AZ CDL air brakes endorsement with our comprehensive Arizona permit practice test. This AZ air brakes CDL test is designed to help you master the key concepts needed to pass the real test. The test features 20 multiple-choice questions covering essential topics such as air brake components, operation, safety inspections, and stopping distance calculations. With a focus on dual air brake systems that enhance safety by providing a backup in case one system fails, this Arizona drivers permit practice test ensures you are well-prepared. The AZ CDL air brakes practice test is crafted based on the official Arizona drivers manual, ensuring the information is accurate and relevant. It's essential to score at least 16 correct answers to pass, simulating the real test conditions. This practice permit test is ideal for those who want a thorough review session, covering all necessary topics to boost confidence and knowledge. AZ's unique driving conditions, such as its hot desert climate and mountainous terrains, can significantly impact brake performance. Understanding these local factors is crucial for safe driving, and our Arizona DMV air brake test incorporates scenarios and questions that address these conditions. In addition to the AZ CDL air brakes practice test, we recommend supplementing your study with additional materials like the drivers handbook, a state-certified drivers ed course, flashcards, and road sign charts. These resources target all areas of the Arizona permit test practice, ensuring you have a well-rounded preparation. After completing the AZ permit test practice, take the time to review your answers. This test review feature allows you to go over any hints and explanations for the questions you missed, helping you understand your mistakes and learn from them. Our practice permit test is an invaluable tool for anyone aiming to obtain their CDL air brakes endorsement in Arizona. By simulating real test conditions and focusing on local driving challenges, this test ensures you're fully prepared for the actual DMV test. Prepare effectively and confidently with our AZ air brakes CDL test, and you'll be on the road to success.
FREE CDL Practice Test App
Pass your Arizona CDL Air Brake test with the NextDoorDriving app. Real questions and answers—100% free and ad-free.
Download on the App Store

Sample Arizona Air Brakes Test Questions

Question 1

Which foundation-brake design is most common on heavy commercial vehicles?

  1. A S-cam drum brake
  2. B Wedge drum brake
  3. C Air-operated disc brake
  4. D Electric drum brake

Correct answer: A – S-cam drum brake

Foundation brakes provide braking at the wheels. The Arizona CDL manual identifies the S-cam drum brake as the most common design and notes that wedge and disc brakes are less common. In an S-cam brake, the cam forces the shoes outward against the inside of the drum.

Source: Arizona Commercial Driver License Manual — § 5.1.8, “Foundation Brakes”

Question 2

Brake fade can occur only in vehicles equipped with drum brakes.

  1. A True
  2. B False

Correct answer: B – False

Braking creates heat in both drum and disc systems. Excessive heat from overusing the service brakes can reduce friction and braking effectiveness, causing fade or failure. Drum expansion is one way heat affects drum brakes, but brake fade is not limited to that design.

Source: Arizona Commercial Driver License Manual — § 5.4.5, “Brake Fading or Failure”

Question 3

What normally supplies the mechanical force that keeps an air-braked vehicle's parking brakes applied?

  1. A Spring pressure
  2. B Air pressure
  3. C Hydraulic pressure
  4. D Electrical power

Correct answer: A – Spring pressure

Federal air-brake standards require a mechanical means that can hold the parking brake after air and fluid pressures are reduced to zero and without electrical power. Spring brakes normally provide that mechanical force. Because the springs do not depend on stored air to remain applied, gradual air leakage will not release them.

Source: Arizona Commercial Driver License Manual — § 5.1.14, “Spring Brakes”, 49 CFR § 571.121, S5.6.3.2 — Standard No. 121; Air Brake Systems

Question 4

During normal driving, what keeps spring parking brakes released?

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

Correct answer: D – Air pressure

Powerful springs apply the parking and emergency brakes when air pressure is removed. During normal driving, air pressure holds those springs back and keeps the brakes released. A serious loss of system pressure allows the springs to apply the brakes.

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

Question 5

The two circuits in a dual air-brake system are called the primary and secondary systems.

  1. A True
  2. B False

Correct answer: A – True

A dual air-brake system contains two separate air systems operated through one set of controls. Each has its own tanks, hoses, and lines. The first is called the primary system, and the other is called the secondary system.

Source: Arizona Commercial Driver License Manual — § 5.2, “Dual Air Brake”

Question 6

Which procedure correctly tests the low-air-pressure warning signal?

  1. A Shut off the engine, turn on electrical power, and repeatedly press and release the brake pedal
  2. B Leave the engine running and push each slack adjuster inward
  3. C Release the parking brake and pull hard on a slack adjuster
  4. D Make a hard road stop while traveling at least 20 mph

Correct answer: A – Shut off the engine, turn on electrical power, and repeatedly press and release the brake pedal

The Arizona inspection procedure calls for shutting off the engine, turning on electrical power, and pressing and releasing the brake pedal to lower tank pressure. The warning must activate before pressure in the lowest tank falls below 60 psi. Federal air-brake equipment standards use the same 60-psi warning threshold for covered vehicles.

Source: Arizona Commercial Driver License Manual — § 5.3.3, “Test Low Pressure Warning Signal”, 49 CFR § 571.121, S5.1.5 — Standard No. 121; Air Brake Systems

More Arizona CDL Practice Tests
Other CDL Endorsements