Free Idaho CDL Air Brakes Test 2025

Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
Based on 2025 ID commercial driver's license manual
Triple-checked for accuracy
Updated for March 2025

If you’re planning to drive commercial motor vehicles (CMVs) with air brakes, our Idaho DMV CDL Air Brakes Practice Tests will help you pass your Air Brakes knowledge exam on your first attempt. In Idaho, should you fail any of the knowledge tests, you must wait three business days and pay a fee before retesting. If you don’t pass, your CDL will include the restriction “L,” preventing you from operating CMVs with air brakes. In Idaho, the Rocky Mountains challenge drivers with steep inclines and declines that make air brakes essential. The mixed challenges along Idaho’s principal transportation routes (I-84, US-95, I-90, US-20) offer everything from mountain passes to the terrain in Yellowstone. Most semi-trucks, tractor-trailers, and large buses rely on air brakes, so the air brakes qualification is essential.

Industries across the Gem State rely on drivers with the air brake qualification. Key industries include agriculture, mining, and tourism (Sun Valley). Major companies requiring the air brakes qualification include Simplot Company and Idaho Milk Transport in the agriculture sector and Old Dominion Freight Line and Western Transport in the logistics sector. Commercial and public transportation are also busy industries requiring drivers with the air brake qualification. Examples are Salt Lake Express, Sun Valley Express, Valley Regional Transit, and all school districts operating full-size school buses. Simply put, the “L” restriction makes operating CMVs equipped with air brakes illegal, making these job prospects (and many more) unattainable.

Our practice tests help you pass your air brake knowledge test. But, the information you learn will also be useful as you practice inspecting and operating CMVs to pass your skills test. The hands-on skills test includes inspecting components, testing for air pressure and leaks, and operating a vehicle equipped with air brakes. The written Air Brakes knowledge test features multiple-choice questions based on the official Idaho CDL manual (Idaho CDL Handbook 2025) and requires a score of at least 80% to pass.

Our CDL Air Brakes Practice Tests cover all that is required for the official DMV knowledge test and mimic the content and format you will face on the test. Additionally, our practice test questions and answers provide responses in real time, which is a scientifically proven method for improving material retention. This feature allows you to learn quickly and confidently pass your official exam on your first attempt.

4.23 out of 5 • 13 votes.

9 min to complete

Available in EN and ES

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What to expect on the actual ID DMV exam

questions

correct answers to pass

80%

passing score

Helpful links

ID DMV website

Official Idaho CDL manual (2025)

More ID DMV Written Exam Resources

ID CDL Air Brakes Test (you are here)

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Our 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.

Written by Andrei Zakhareuski Updated over a week ago

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.

FREE Idaho CDL Air Brakes Test

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