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
Perfect for first-time, renewal applicants
MI CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
An air compressor can be cooled by _______.
2.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
3.
All air brake equipped vehicles have:
4.
The most important thing to do when a low air pressure warning comes on is:
5.
Emergency stab braking is:
6.
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
7.
The application pressure gauge shows how much air pressure you:
8.
To stop the vehicle, air brakes systems use:
9.
When the air system is low ________.
10.
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.
11.
What happens when your brake drums get very hot?
12.
If the spring brakes are on, when should you push the brake pedal?
13.
If the low air pressure warning light comes on, you should:
14.
What tells the driver how much air pressure is in the air tanks?
15.
16.
After the initial pressure drop, air leakage for combination vehicles should be less than:
17.
To stop the vehicle, the brake shoes and linings are pushed against:
18.
The most common type of foundation brake is?
19.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
20.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
21.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
22.
Why do air brakes take longer to stop than hydraulic brakes?
23.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
24.
Manual air tank drains require:
25.
What is the function of a safety valve?