# 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
Perfect for first-time, renewal applicants
OH CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
2.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
3.
The most common type of foundation brakes are:
4.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
5.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
6.
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
7.
To test the vehicle's service brakes, move the vehicle:
8.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
9.
If your vehicle has an alcohol evaporator, it is there to:
10.
When the safety valve releases air this indicates ___________.
11.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
12.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
13.
If the spring brakes are on, when should you push the brake pedal?
14.
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
15.
If the low air pressure warning light comes on, you should:
16.
A device that limits the amount of air provided to the front brakes is a:
17.
The S-cam:
18.
Under normal braking conditions, the vehicle:
19.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
20.
All of the following apply if the low air pressure warning signal does not work except:
21.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
22.
Which of the following helps the stop light switch work?
23.
If air supply drops when driving, the tractor protection valve ________.
24.
The spring brakes of a tractor will come on when the air pressure falls within _______.
25.
Vehicles without automatic air tank drains need to be checked manually to remove ________?