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.
To test air service brakes you should:
2.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
3.
Air brakes consist of ________.
4.
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
5.
The stop light switch:
6.
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?
7.
A mechanical device that drops a low air warning into a drivers view is called a:
8.
The supply pressure gauge shows how much pressure:
9.
Brake fade is caused by:
10.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
11.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
12.
What is a \"Wig Wag\"
13.
When checking the air pressure buildup, pressure should build:
14.
If your vehicle has an alcohol evaporator, every day during cold weather you should:
15.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
16.
If air supply drops when driving, the tractor protection valve ________.
17.
Initial air leakage rate for combination vehicles should be:
18.
Stab braking should only be used:
19.
The belt of a belt-driven air compressor should be ________.
20.
Air tanks should be drained:
21.
The parking brake should be used:
22.
A warning to drivers behind you that the air brakes have been applied is the:
23.
Vehicles with ABS have malfunction lamps that are what color?
24.
What is an alternative name for a brake pedal?
25.
Vehicles with air brakes have pressure gauges connected to the _______.