Free Minnesota CDL Air Brakes Practice Test 2023

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 2021 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
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
A dual air brake system ________.
In case of a low air situation, the spring brakes should come on at:
While applying the brakes, what tells the driver how much air pressure is being used?
With air brake vehicles, the parking brake should be used:
When increased application pressure to maintain the same speed becomes necessary, you should ______.
Normally during anti-lock braking, the driver:
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
What must the air pressure be, at minimum, in both parts of a dual air brake system?
Besides heat, another cause of brake fade is:
Pressing and releasing the brake pedal unnecessarily:
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
After the initial pressure drop, air leakage for combination vehicles should be less than:
Under normal braking conditions, the vehicle:
With air brake vehicles, the parking brakes should be used:
To test the parking brake, stop the vehicle, put the parking brake on, and:
At what level will the low air warning usually take effect?
Which of the following helps the stop light switch work?
The safety valve in the air compressor tank is set to open at _____.
During a normal drive, the spring brakes are held back by _____.
What is used to put alcohol into the system and reduce ice risk?
What is proper braking technique for drivers travelling down a hill or any other downgrade?
What is the purpose of an air storage tank?
To test the parking brake you should _______.