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 automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks fall below ____ psi.
Excessive use of the service brakes results in overheating which can lead to:
A mechanical device that drops a low air warning into a drivers view is called a:
Excessive heat caused by using your brakes too often can also cause:
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
When parking a vehicle with a modulating control valve ________.
When using a vehicle with air brakes, the parking needs to be used _______.
When your brake's main air pressure is lost ________.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
Spring brakes will come on automatically, but the parking brake can also be applied:
When brakes are applied, the brake shoes will press against the:
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
If air pressure is not built up within the correct amount of time, then:
How should you check that your service brakes are working properly?
The service brake system ________.
Why should you check the brake adjustment often?
How are brakes designed?
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
The air tanks must be drained because:
Manual air tank drains require:
Water and oil _______.
What happens when pressure is put on the air brakes?
If your brakes are wet, what should you do to dry them quicker?