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 safety valve discharges automatically at the pressure of:
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
Air tanks need to be drained ______.
A mechanical device that drops a low air warning into a drivers view is called a:
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
The application pressure gauge shows how much air pressure you:
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
What should a driver do when the low air pressure warning signal comes on?
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
What happens when your brake drums get very hot?
What tells the driver how much air pressure is in the air tanks?
In case of emergency stops, drivers should:
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
How should the air leakage rate be tested?
At what level will the low air warning usually take effect?
The most common type of foundation brake is?
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
Why should you drain water from compressed air tanks?
Brake drums or discs _______.
You should use the parking brake _____________.
On a long or steep downgrade, how should vehicle speed be primarily controlled?
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?
Vehicles with air brakes have pressure gauges connected to the _______.
What happens when pressure is put on the air brakes?
If your brakes are wet, what should you do to dry them quicker?