Free Michigan CDL Air Brakes Practice Test 2022

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 2022 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
1.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
2.
The safety valve discharges automatically at the pressure of:
3.
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.
4.
Air tanks need to be drained ______.
5.
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
6.
A mechanical device that drops a low air warning into a drivers view is called a:
7.
The ____ shows how much pressure is in the air tanks.
8.
Where is the modulating control valve located on some vehicles?
9.
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
10.
Generally, air governor cut-in should be at:
11.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
12.
What is the purpose of an antilock braking system (ABS)?
13.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
14.
What is a \"Wig Wag\"
15.
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.
16.
Besides heat, another cause of brake fade is:
17.
Average stopping distance under normal conditions at 55 mph is:
18.
Which of the following helps the stop light switch work?
19.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
20.
Stop light switches are necessary because ________.
21.
Air tanks should be drained:
22.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
23.
On a long or steep downgrade, how should vehicle speed be primarily controlled?
24.
In a dual air brake system, one system will typically control the rear brakes, and the other:
25.
Vehicles with air brakes have pressure gauges connected to the _______.