Free Ohio CDL Air Brakes Practice Test 2023

Do you need an Ohio Air Brakes endorsement or an L endorsement for your commercial driving license? The Ohio CDL Air Brake test has some differences from other endorsements because your license will receive a mark of restriction if you fail the test. So having good preparation before exam day is very necessary. To ensure that our questions are relevant, all of our CDL practice test packs are based on the Ohio CDL Manual. Each question has a detailed explanation for you to thoroughly learn the format and the topic. Don't be afraid of having a restriction on your license. Let’s try our Ohio CDL Practice Test to get ready to pass the Ohio CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 OH commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
OH CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
A low pressure warning signal could be __________.
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
When testing air leakage rates for single vehicles, initial loss rate should be less than:
When performing the controlled braking method for an emergency stop, you are _________.
In most newer vehicles, the parking brake control will be:
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
If you must make an emergency stop, you should brake so you:
Why is manually adjusting automatic slack adjusters dangerous?
What must the air pressure be, at minimum, in both parts of a dual air brake system?
When checking the air pressure buildup, pressure should build:
Besides heat, another cause of brake fade is:
The parking brake should not be used when wet in freezing temperatures, or:
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
With air brake vehicles, the parking brakes should be used:
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
If you need to make an emergency stop, you should brake so that you can ________.
The air compressor is connected to the engine through ______.
The air tanks must be drained because:
Automatic adjusters should ________.
Why should air tanks be drained completely?
What does ABS stand for?
To prevent too much pressure from building up in the system, what is installed?
To test the parking brake you should _______.