Do you need an Oklahoma Air Brakes endorsement or an L endorsement for your commercial driving license? The Oklahoma CDL Air Brake 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 Oklahoma 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 Oklahoma CDL Practice Test to get ready to pass the Oklahoma CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2022 OK commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
OK CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The most common type of foundation brakes are:
2.
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?
3.
To test the vehicle's service brakes, move the vehicle:
4.
Under normal conditions, in order to engage the parking brakes the driver should:
5.
Excessive heat caused by using your brakes too often can also cause:
6.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
7.
Spring brakes will generally come on at:
8.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
9.
When performing the controlled braking method for an emergency stop, you are _________.
10.
Air governor cut-out should be at around:
11.
If the air compressor should develop a leak, what keeps the air in the tanks?
12.
Spring brakes will come on automatically, but the parking brake can also be applied:
13.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
14.
The parking brake knob is usually:
15.
When brakes are applied, the brake shoes will press against the:
16.
The emergency spring brake release knob is:
17.
You should avoid using the parking brake when _______.
18.
The most common type of foundation brake is?
19.
Automatic adjusters should ________.
20.
Why should air tanks be drained completely?
21.
On large buses low pressure warning devices usually signal at ______.
22.
To prevent too much pressure from building up in the system, what is installed?
23.
What is the purpose of an air storage tank?
24.
Water and oil _______.
25.
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?