Free Missouri CDL Air Brakes Practice Test 2022

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

Our CDL practice tests:
Based on 2022 MO commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MO 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.
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?
3.
The stop light switch:
4.
Air tanks need to be drained ______.
5.
How far should manual slack adjusters move before they need to be adjusted?
6.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
7.
While applying the brakes, what tells the driver how much air pressure is being used?
8.
When parking a vehicle with a modulating control valve ________.
9.
When using a vehicle with air brakes, the parking needs to be used _______.
10.
All of the following are factors in total stopping distance except:
11.
If the low air pressure warning light comes on, you should:
12.
When checking the air pressure buildup, pressure should build:
13.
The parking brake should not be used when wet in freezing temperatures, or:
14.
The S-cam:
15.
After the initial pressure drop, air leakage for combination vehicles should be less than:
16.
All of the following apply if the low air pressure warning signal does not work except:
17.
Why should you check the brake adjustment often?
18.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
19.
The air compressor is connected to the engine through ______.
20.
The air tanks must be drained because:
21.
If the air compressor has its own oil supply you should do what before driving?
22.
What is a wig wag ?
23.
In a dual air brake system, one system will typically control the rear brakes, and the other:
24.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?
25.
Vehicles with air brakes have pressure gauges connected to the _______.