- Updated for March 2025
- Based on 2025 NH commercial driver's license manual
Free New Hampshire CDL Air Brakes Test 2025
Failure to pass the New Hampshire DMV CDL Air Brakes Knowledge Test means that your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. This “L” restriction will negatively affect your job prospects in this market. Failing the air brakes test in New Hampshire results in a one-day waiting period and a fee should you decide to retake the test. Our New Hampshire DMV CDL Air Brakes Practice Tests are the perfect tool for passing your knowledge exam on the first attempt.
Navigating New Hampshire’s diverse terrain, including the steep grades of Mount Washington and the winding roads of the Kancamagus Highway, requires a reliable air brake system. This need for air brakes is only compounded by winter ice and snow. Key transportation routes in New Hampshire include I-93 (a major north-south route connecting Boston, NH’s Lakes Region, and the White Mountains), US-4 (an important east-west highway linking rural to urban areas), and US-112 (Kancamagus Highway) (a mountain road with steep grades and sharp curves). Most semi-trucks, tractor-trailers, and commercial buses rely on air brakes for safe travel. Hence, removing the air brake restriction from your CDL is vital for expanded job opportunities.
The Granite State relies on drivers with the air brake qualification in key industries, including forestry, manufacturing, and tourism. Companies requiring the air brake qualification include Land Air Express (Bow) and L.A. Limousine (Manchester) in the trucking industry and Concord Coach Lines (Concord) and Dartmouth Coach (Lebanon) in the charter bus sector. Timberwolf Logging (Littleton), BW Timber Harvesting (North Haverhill), and Lumberjack Logging Company, LLC (Goffstown) are major logging industry companies requiring air brake-qualified drivers. Furthermore, New Hampshire’s school districts use air brakes on their full-size buses, employing hundreds of air brake-qualified drivers. The “L” restriction makes these jobs unattainable.
The written Air Brakes knowledge test features multiple-choice questions based on the state’s CDL manual (New Hampshire CDL Handbook 2025) and requires a minimum passing score of 80%. On our practice tests, you’ll receive instant feedback on all your responses, helping you learn faster and ensuring you pass the knowledge test. As a bonus, the information you learn will also help you prepare to pass your skills test!
Our CDL Air Brakes Practice Tests cover everything needed and mimic the official DMV Air Brakes Knowledge Test.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual NH DMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- The purpose of a supply pressure gauge is
- Why must you pass a knowledge test on air brakes?
- The tractor protection valve
- Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- How do brakes work on a long, steep downgrade?
- Which vehicles must have low air pressure warning signals?
- Which of the following can cause brakes to fade or fail?
- When should you drain your air tanks?
- How would you check your truck's slack adjusters?
- If the air tanks are not drained,
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- An anti-lock braking system (ABS)
- Which of the following are true about a dual air brake system?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Which of the following is NOT part of the drum brake?
- At what measurement is the safety valve USUALLY set to open?
- Which of the following is NOT part of the air brake system?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- When should you use the parking brake?
- Which of the following should you do before leaving your vehicle unattended?
- Slack adjusters are
- After the initial drop, the maximum acceptable leakage rates per minute are
- What is the best way to test your vehicle's low air pressure warning signal?
- Spring brakes are
- Under which conditions are front wheel brakes good?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
- Alabama: Test 1 / Test 2
- Alaska: Test 1 / Test 2
- Arizona: Test 1 / Test 2
- Arkansas: Test 1 / Test 2
- California: Test 1 / Test 2
- Colorado: Test 1 / Test 2
- Connecticut: Test 1 / Test 2
- Delaware: Test 1 / Test 2
- District of Columbia: Test 1 / Test 2
- Florida: Test 1 / Test 2
- Georgia: Test 1 / Test 2
- Hawaii: Test 1 / Test 2
- Idaho: Test 1 / Test 2
- Illinois: Test 1 / Test 2
- Indiana: Test 1 / Test 2
- Iowa: Test 1 / Test 2
- Kansas: Test 1 / Test 2
- Kentucky: Test 1 / Test 2
- Louisiana: Test 1 / Test 2
- Maine: Test 1 / Test 2
- Maryland: Test 1 / Test 2
- Massachusetts: Test 1 / Test 2
- Michigan: Test 1 / Test 2
- Minnesota: Test 1 / Test 2
- Mississippi: Test 1 / Test 2
- Missouri: Test 1 / Test 2
- Montana: Test 1 / Test 2
- Nebraska: Test 1 / Test 2
- Nevada: Test 1 / Test 2
- New Hampshire: Test 1 / Test 2
- New Jersey: Test 1 / Test 2
- New Mexico: Test 1 / Test 2
- New York: Test 1 / Test 2
- North Carolina: Test 1 / Test 2
- North Dakota: Test 1 / Test 2
- Ohio: Test 1 / Test 2
- Oklahoma: Test 1 / Test 2
- Oregon: Test 1 / Test 2
- Pennsylvania: Test 1 / Test 2
- Rhode Island: Test 1 / Test 2
- South Carolina: Test 1 / Test 2
- South Dakota: Test 1 / Test 2
- Tennessee: Test 1 / Test 2
- Texas: Test 1 / Test 2
- Utah: Test 1 / Test 2
- Vermont: Test 1 / Test 2
- Virginia: Test 1 / Test 2
- Washington: Test 1 / Test 2
- West Virginia: Test 1 / Test 2
- Wisconsin: Test 1 / Test 2
- Wyoming: Test 1 / Test 2
Your go-to, trusted source
Experience the Driving-Tests differenceOur commitment to accuracy and quality in our practice tests
Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.
At Driving-Tests.org, we understand the importance of reliable and accurate practice tests to help you prepare for your DMV exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.
Here's an inside look at how we maintain the highest quality in our practice tests.
Content Creation and Verification Process
- Alignment with Official Manuals:
Every question we develop is based on the most recent version of each state's official driving manual. Our team regularly monitors each state DMV's website for the latest updates to ensure our practice tests are always aligned with the most current information. - Community Feedback Integration:
We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation. - Expert Content Creation:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy. - Rigorous Review Process:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors. - User Feedback Mechanism:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly. - Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the DMV manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the DMV publishes them.
Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your DMV exam.
Pass the First Time – Guaranteed
You’re moments away from your results.
Before you view them, see how 1.15 million drivers used Premium to pass faster.
Real Exam-Like New Hampshire Questions
Get all exam-like questions seen on the real test.
99.06% Pass Rate vs. 49% Average
Most Premium users pass on their first try.
Money-Back Guarantee
We stand behind you until you pass.
