Ohio CDL Air Brakes Practice Test (OH) 2

4.9 out of 5 (124 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready to ace your Ohio CDL air brake endorsement test with our all-inclusive Ohio CDL air brake practice test. This DMV air brake test is designed to help you master all the essential topics, from understanding the components and operation of air brakes to performing safety inspections and calculating stopping distances. With 20 carefully crafted multiple-choice questions, this Ohio BMV practice test ensures that you're thoroughly prepared for the real test. In Ohio, driving conditions can vary greatly, from the bustling urban streets of Columbus to the rural roads of Amish country. Knowing how to handle air brakes under these diverse conditions is crucial. This Ohio CDL air brake test includes questions on dual air brake systems, which are vital for ensuring safety, especially on Ohio's winding country roads and busy highways. Dual systems provide a backup in case one system fails, a critical feature for navigating Ohio's varied terrain. At the end of the Ohio DMV practice test, you will receive a detailed summary of your performance. This summary highlights the questions you answered incorrectly and provides the correct answers, enabling you to learn from your mistakes and improve your knowledge. This feedback is invaluable for reinforcing your understanding and ensuring you're ready to pass the CDL air brakes CDL test on your first attempt. Our Ohio practice permit test is regularly updated to reflect the most current driving laws and regulations, ensuring that you are studying the most relevant information. This commitment to freshness means you can trust that the material you are studying is up-to-date and accurate, providing you with the best possible preparation for your Ohio CDL air brakes practice test. To maximize your preparation, we recommend supplementing this permit practice test with additional study materials such as the Ohio driver's handbook, a state-certified drivers ed course, flashcards, and road sign charts. These resources will help you target all areas of the Ohio DMV permit test, ensuring a comprehensive understanding of the material.
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Sample Ohio Air Brakes Test Questions

Question 1

The air compressor governor determines when the compressor begins and stops pumping air into the storage tanks. True or false?

  1. A True
  2. B False

Correct answer: A – True

The governor uses cut-in and cut-out pressures to control compressor operation. It generally allows pumping to resume around 100 psi and stops pumping around 125 psi, subject to the manufacturer's specifications. The Ohio manual identifies the governor as the component that controls when the compressor sends air to the storage tanks.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 5.1.2, “Air Compressor Governor”

Question 2

On a newer air-brake vehicle, what color identifies the diamond-shaped parking-brake control?

  1. A Red
  2. B Green
  3. C Yellow
  4. D Blue

Correct answer: C – Yellow

Newer air-brake vehicles use a yellow, diamond-shaped push-pull knob for the parking brakes. Pulling the knob out applies the spring brakes, while pushing it in releases them when sufficient air pressure is available. Older vehicles may use a different control design.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 5.1.15, “Parking Brake Controls”

Question 3

During an applied air-leakage test, a combination vehicle may lose no more than 1 psi in one minute. True or false?

  1. A True
  2. B False

Correct answer: B – False

With the service brake fully applied and the gauge stabilized, a combination vehicle may lose no more than 4 psi in one minute. A loss exceeding that amount indicates excessive leakage that must be corrected before driving. The corresponding applied-leakage limit for a single vehicle is 3 psi per minute.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 5.3.3, “Step 7 Final Air Brake Check”

Question 4

If an air-brake vehicle has manually operated tank drains, when should the storage tanks be drained?

  1. A At the end of each day of driving
  2. B After every four hours of operation
  3. C Once each week
  4. D Every two weeks

Correct answer: A – At the end of each day of driving

The Ohio manual directs drivers to empty manually drained air tanks at the end of each day of driving. Compressed air can carry water and compressor oil into the tanks, where they collect at the bottom. Complete draining helps prevent contamination and water-related problems, including freezing that could cause brake failure.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 5.1.4, “Air Tank Drains”

Question 5

Parking brakes should not be applied while the vehicle's brakes are extremely hot. True or false?

  1. A True
  2. B False

Correct answer: A – True

Parking brakes can be damaged if they are applied immediately after the brakes become extremely hot, such as after descending a steep grade. On a level surface, use wheel chocks to secure the vehicle while the brakes cool. Apply the parking brakes only after the overheated brakes have cooled sufficiently.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 5.4.8, “Parking Brakes”

Question 6

An air-braked truck or bus is required to have a low-air-pressure warning signal. True or false?

  1. A True
  2. B False

Correct answer: A – True

Federal air-brake equipment standards require trucks and buses to provide a continuous warning when service-reservoir pressure is below 60 psi. During the Ohio CDL air-brake check, the warning must activate before indicated tank pressure falls below 55 psi. This gives the driver notice before spring brakes may apply automatically at a much lower pressure.

Source: Ohio Commercial Driver License Manual (HSY 7605) — § 5.1.11, “Low Air Pressure Warning”, 49 CFR § 571.121, S5.1.5 – Standard No. 121; Air brake systems

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