- 0 Incorrect (6 allowed to pass)
- 0 Correct
- Updated for February 2025
- Based on 2025 ID commercial driver's license manual
Free Idaho CDL Air Brakes Test 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.
- 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 ID DMV exam
questions
correct answers to pass
passing score
List of questions (classic view)
- When should you drain your air tanks?
- The tractor protection valve
- Under which conditions are front wheel brakes good?
- The purpose of a supply pressure gauge is
- Which of the following is NOT part of the air brake system?
- At what measurement is the safety valve USUALLY set to open?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Why must you study air brakes in the state of Idaho?
- Which of the following is NOT part of the drum brake?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- Which of the following should you do before leaving your vehicle unattended?
- Which vehicles must have low air pressure warning signals?
- How do brakes work on a long, steep downgrade?
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- What is the best way to test your vehicle's low air pressure warning signal?
- When should you use the parking brake?
- Which of the following are true about a dual air brake system?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- If the air tanks are not drained,
- An anti-lock braking system (ABS)
- How would you check your truck's slack adjusters?
- After the initial drop, the maximum acceptable leakage rates per minute are
- Slack adjusters are
- Spring brakes are
- Which of the following can cause brakes to fail or fade?
- 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
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Here's an inside look at how we maintain the highest quality in our practice tests.
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- 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.
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