# 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.
Air brakes consist of ________.
2.
When inspecting air brakes:
3.
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
4.
All air brake equipped vehicles have:
5.
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
6.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
7.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
8.
In a controlled braking emergency:
9.
The application pressure gauge shows how much air pressure you:
10.
What should a driver do when the low air pressure warning signal comes on?
11.
Air governor cut-out should be at around:
12.
If the air compressor should develop a leak, what keeps the air in the tanks?
13.
The safety valve reduces pressure at ___ psi.
14.
The parking brake should not be used when wet in freezing temperatures, or:
15.
Average stopping distance under normal conditions at 55 mph is:
16.
The S-cam:
17.
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
18.
The brake pedal in an air brake system _______.
19.
Brake drums should not have cracks longer than what length?
20.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
21.
If air supply drops when driving, the tractor protection valve ________.
22.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
23.
The governor stops the compressor from pumping air at:
24.
Vehicles with ABS have malfunction lamps that are what color?
25.
On a long or steep downgrade, how should vehicle speed be primarily controlled?