Free Michigan CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 MI commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MI CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
A low air pressure warning signal is ________.
How far should manual slack adjusters move before they need to be adjusted?
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
On a long or steep downgrade, the foot brakes should be used:
If you must make an emergency stop, you should brake so you:
When increased application pressure to maintain the same speed becomes necessary, you should ______.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
Air braking takes more time than hydraulic braking because:
After the initial pressure drop, air leakage for single vehicles should be less than:
The manual adjustment of automatic slack adjusters is:
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
Controlled braking is only possible _________.
The service brake system ________.
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
If one air system is very low on pressure _______.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
Why should you drain water from compressed air tanks?
The parking brake should be used:
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
A warning to drivers behind you that the air brakes have been applied is the:
What happens when pressure is put on the air brakes?