# 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
Perfect for first-time, renewal applicants
MN CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
2.
The stop light switch:
3.
How far should manual slack adjusters move before they need to be adjusted?
4.
Air tanks need to be drained ______.
5.
Emergency stab braking is:
6.
Under normal conditions, in order to engage the parking brakes the driver should:
7.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
8.
Spring brakes will generally come on at:
9.
When performing the controlled braking method for an emergency stop, you are _________.
10.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
11.
If you must make an emergency stop, you should brake so you:
12.
All of the following are factors in total stopping distance except:
13.
Air braking takes more time than hydraulic braking because:
14.
After the initial pressure drop, air leakage for single vehicles should be less than:
15.
The trailer air supply knob is usually:
16.
If your vehicle has an alcohol evaporator, every day during cold weather you should:
17.
Pushing the brake pedal down harder __________.
18.
If one air system is very low on pressure _______.
19.
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
20.
The braking power of the spring brakes ______.
21.
Brake linings should not be _______.
22.
Initial air leakage rate for combination vehicles should be:
23.
Vehicles with air brakes _________.
24.
The spring brakes of a tractor will come on when the air pressure falls within _______.
25.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?