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
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
Excessive use of the service brakes results in overheating which can lead to:
How far should manual slack adjusters move before they need to be adjusted?
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
Excessive heat caused by using your brakes too often can also cause:
Why drain water from compressed air tanks?
The type of brakes that clamp the rotor between the brake shoes is:
When should the spring brakes activate?
When you release the brakes and reduce the air pressure what makes up for that air loss?
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
The level at which the air compressor stops pumping air is:
The emergency spring brake release knob is:
If air pressure is not built up within the correct amount of time, then:
The trailer air supply knob is usually:
To test the parking brake, stop the vehicle, put the parking brake on, and:
Why should you check the brake adjustment often?
How are brakes designed?
The braking power of the spring brakes ______.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
The belt of a belt-driven air compressor should be ________.
A warning to drivers behind you that the air brakes have been applied is the:
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
What is the purpose of an air storage tank?