Free Minnesota CDL Air Brakes Practice Test 2022

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

Our CDL practice tests:
Based on 2022 MN commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MN CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The air compressor stops pumping air at what psi?
2.
To test air service brakes you should:
3.
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
4.
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?
5.
The main factor in causing brake fade is:
6.
The low air pressure warning signal indicates:
7.
Where is the modulating control valve located on some vehicles?
8.
When should the spring brakes activate?
9.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
10.
Generally, air governor cut-in should be at:
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 the purpose of an antilock braking system (ABS)?
13.
Why is manually adjusting automatic slack adjusters dangerous?
14.
The safety valve is set automatically when pressure is:
15.
If the spring brakes are on, when should you push the brake pedal?
16.
The emergency spring brake release knob is:
17.
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
18.
How should the air leakage rate be tested?
19.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
20.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
21.
Automatic adjusters should ________.
22.
The belt of a belt-driven air compressor should be ________.
23.
You should use the parking brake _____________.
24.
What is a wig wag ?
25.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?