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
A low air pressure warning signal is ________.
During normal driving, spring brakes are usually held back by:
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
An air brake system is fully charged at what psi?
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
What is a \"Wig Wag\"
Which of these is NOT a proper time to apply the parking brakes?
All of the following apply if the low air pressure warning signal does not work except:
You should avoid using the parking brake when _______.
Automatic air tanks _______.
Why does a heavily loaded vehicle need a longer distance to stop?
The air compressor is connected to the engine through ______.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
Stab braking should only be used:
How often should alcohol containers be checked during cold weather?
On large buses low pressure warning devices usually signal at ______.
Spring brakes are applied:
What does ABS stand for?
To prevent too much pressure from building up in the system, what is installed?
The warning light and buzzer will come on when the air pressure in either system drops below what psi?