North Dakota CDL Air Brakes Practice Test (ND) 2

5 out of 5 (43 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Are you ready to take the next step toward obtaining your CDL air brakes endorsement in ND? Our North Dakota permit practice test is designed to make your preparation as smooth and effective as possible. With 20 multiple-choice questions that cover critical topics such as air brake components, operation, safety inspections, and stopping distance calculations, this CDL air brakes practice test ensures you're well-prepared for the real deal. The ND CDL air brake test is tailored to the specific driving laws and regulations of our great state. This means you're not just getting generic information; you're learning the precise details that matter here in North Dakota. Whether you're driving through the plains or navigating the rugged terrain during our harsh winters, understanding these regulations is crucial for safe driving. One of the standout features of our ND DMV air brake test is its accessibility. Available online 24/7, you can take the North Dakota drivers permit practice test at any time that fits your schedule. This flexibility is especially beneficial for those balancing work, family, and study commitments. No more waiting for a driving school to slot you in - you set your own pace and convenience. Our ND air brakes CDL test also mirrors the format and content of the actual CDL test, providing a realistic practice experience. By familiarizing yourself with the type of questions and structure you'll encounter, you'll gain confidence and reduce test-day anxiety. Remember, you need to answer at least 16 questions correctly to pass, so thorough preparation is key. In North Dakota, the ability to manage dual air brake systems is vital, particularly given our varying road conditions and weather patterns. This CDL air brake practice test includes essential facts about these systems, ensuring you're equipped with the knowledge to handle any situation safely. Prepare confidently for your CDL with our ND practice permit test, knowing that you're studying relevant, state-specific material in a format that will make test day feel like just another practice session.
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Sample North Dakota Air Brakes Test Questions

Question 1

Air tanks with manual drain valves need to be drained only once a week.

  1. A. True
  2. B. False

Correct answer: B. – False

North Dakota’s CDL manual instructs drivers to drain manually operated air tanks at the end of each day of driving. Water and compressor oil collect in the tanks and can damage the air-brake system. In cold weather, accumulated water may freeze and contribute to brake failure.

Source: North Dakota Commercial Driver License Manual (2025–2027) — § 5.1.4, “Air Tank Drains”

Question 2

A lightly loaded vehicle is less likely to skid when low air pressure causes the spring brakes to apply.

  1. A. True
  2. B. False

Correct answer: B. – False

Lightly loaded vehicles may skid out of control when their spring brakes apply, especially on slippery roads. Spring brakes can begin applying when air pressure drops into the 20-to-45-psi range. Stop safely while enough tank pressure remains to operate the service brakes rather than waiting for the spring brakes.

Source: North Dakota Commercial Driver License Manual (2025–2027) — § 5.4.7, “Low Air Pressure”

Question 3

Repeated heavy use of the service brakes can create enough heat to cause brake fade or failure.

  1. A. True
  2. B. False

Correct answer: A. – True

Braking creates heat, and excessive use of the service brakes can produce more heat than the system can handle. High temperatures reduce friction in the brake linings and cause brake drums to expand. Continued overuse can leave the vehicle without enough braking force to slow or stop safely.

Source: North Dakota Commercial Driver License Manual (2025–2027) — § 5.4.5, “Brake Fading or Failure”

Question 4

If the brakes are safe to use, a driver may leave the vehicle briefly without applying the parking brakes.

  1. A. True
  2. B. False

Correct answer: B. – False

North Dakota’s CDL manual says to use the parking brakes whenever you park, including when leaving for only a short time. If the brakes are extremely hot or very wet in freezing temperatures, secure the vehicle with wheel chocks instead. An unsecured vehicle could roll and cause injury or property damage.

Source: North Dakota Commercial Driver License Manual (2025–2027) — § 5.4.8, “Parking Brakes”

Question 5

During stab braking, keep full brake pressure applied after the wheels lock.

  1. A. True
  2. B. False

Correct answer: B. – False

Stab braking calls for applying the brakes fully and then releasing them when the wheels lock. Wait until the wheels begin rolling before applying the brakes fully again. Reapplying too soon keeps the wheels locked, prevents the vehicle from straightening, and can prolong the skid.

Source: North Dakota Commercial Driver License Manual (2025–2027) — § 2.17.2, “How to Stop Quickly and Safely”

Question 6

In the spring-brake system commonly used for parking and emergency braking, what force applies the brakes when air pressure is removed?

  1. A. Compressed-air force
  2. B. Spring force
  3. C. Hydraulic-fluid force
  4. D. Electrical force

Correct answer: B. – Spring force

Powerful springs are normally held back by air pressure while the vehicle is moving. Removing that air allows the springs to apply the brakes. This mechanical force is commonly used because parking and emergency brakes must not depend on air pressure that may eventually leak away.

Source: North Dakota Commercial Driver License Manual (2025–2027) — § 5.1.14, “Spring Brakes”

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