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.
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?
2.
Air brakes consist of ________.
3.
During normal driving, spring brakes are usually held back by:
4.
A dual air brake system ________.
5.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
6.
Generally, air governor cut-in should be at:
7.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
8.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
9.
When your brake's main air pressure is lost ________.
10.
Why is manually adjusting automatic slack adjusters dangerous?
11.
The air compressor governor controls:
12.
What tells the driver how much air pressure is in the air tanks?
13.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
14.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
15.
The most common type of foundation brake is?
16.
If one air system is very low on pressure _______.
17.
Which of the following helps the stop light switch work?
18.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
19.
Why should air tanks be drained completely?
20.
How often should alcohol containers be checked during cold weather?
21.
Vehicles with air brakes _________.
22.
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
23.
The parking brake should be used:
24.
To test the parking brake you should _______.
25.
What happens when pressure is put on the air brakes?