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 most common type of foundation brakes are:
2.
The safety valve discharges automatically at the pressure of:
3.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
4.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
5.
The most important thing to do when a low air pressure warning comes on is:
6.
On a long or steep downgrade, the foot brakes should be used:
7.
The ____ shows how much pressure is in the air tanks.
8.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
9.
Brake fade is caused by:
10.
To stop the vehicle, air brakes systems use:
11.
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
12.
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
13.
If your truck has a dual air brake system, and one of the systems is low on pressure:
14.
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
15.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
16.
Repeatedly partially increasing and pressing the brake pedal may result in:
17.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
18.
Why should you drain water from compressed air tanks?
19.
Stop light switches are necessary because ________.
20.
How does the antilock brake system benefit the driver?
21.
To check the air compressor governor's "cut in" and "cut out" pressures you need to _________.
22.
What is the purpose of a supply pressure gauge?
23.
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
24.
In a dual air brake system, one system will typically control the rear brakes, and the other:
25.
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?