- Updated for March 2025
- Based on 2025 WY commercial driver's license manual
Free Wyoming CDL Air Brakes Test 2025
Most semi-trucks, tractor-trailers, and commercial buses rely on air brakes for safe navigation. Therefore, securing a CDL without the air brake restriction is an absolute priority for anyone wanting to expand their job opportunities. Without passing the Wyoming DOT CDL Air Brakes Knowledge Test, your CDL will include the restriction “L,” preventing you from operating commercial motor vehicles (CMVs) with air brakes. This restriction closes the door to a long list of jobs. A one-day waiting period and retest fee (should you decide to take it again) will result if you fail the air brakes knowledge test. Our Wyoming DOT CDL Air Brakes Practice Tests will help you pass your knowledge exam on the first attempt.
The steep grades of Wyoming’s Rocky Mountains and high plains, the long highways with sparse services, and the winter snow, ice, and high winds, demand reliable braking systems and air brake-qualified drivers for heavy CMVs. Key transportation routes include I-80 (an east-west highway crossing the Rocky Mountains), I-25 (a north-south route connecting to Colorado and Montana), and US-287 (a route through mountainous areas).
The Equality State relies on drivers with the air brake qualification in key industries, including energy, agriculture, tourism, and freight. Major companies requiring drivers with this qualification include Peabody Energy, Halliburton, and ExxonMobil in the energy and mining industries; and JBS and Wyoming Beef in the agriculture sector. XPO Logistics, FedEx Freight, and UPS are major companies requiring air brake-qualified drivers in the freight and logistics sector. In the tourism and charter bus industry, Greyhound, Wyoming Stage Lines, LLC., and Alpenglow Tours are major companies whose buses are equipped with air brakes for passenger transportation as well as the hundreds of Wyomingfull-size school buses. The “L” restriction makes all these jobs unattainable.
Based on the state’s CDL manual (Wyoming CDL Handbook 2025), the written Air Brakes knowledge test features multiple-choice questions and a minimum passing score of 80%. Our CDL Air Brakes Practice Tests cover all essential knowledge for the official DOT Air Brakes Knowledge Test. The material covered will also be useful as you prepare to pass your skills test. Additionally, our practice tests mimic the official knowledge test and offer real-time feedback on all responses. This immediate display of feedback is scientifically proven to help you learn faster and ensure you pass the 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 WY DOT exam
questions
correct answers to pass
passing score
List of questions (classic view)
- When should you drain your air tanks?
- Under which conditions are front wheel brakes good?
- Which of the following can cause brakes to fade or fail?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- 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?
- Why must you pass a knowledge test on air brakes?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- What is the best way to test your vehicle's low air pressure warning signal?
- How would you check your truck's slack adjusters?
- Slack adjusters are
- When should you use the parking brake?
- An anti-lock braking system (ABS)
- Spring brakes are
- Which of the following should you do before leaving your vehicle unattended?
- Which of the following is NOT part of the air brake system?
- After the initial drop, the maximum acceptable leakage rates per minute are
- At what measurement is the safety valve USUALLY set to open?
- The purpose of a supply pressure gauge is
- If the air tanks are not drained,
- Which of the following is NOT part of the drum brake?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- Which of the following are true about a dual air brake system?
- Which vehicles must have low air pressure warning signals?
- The tractor protection valve
- 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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