Free Mississippi CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 MS commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MS CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
In case of a low air situation, the spring brakes should come on at:
Your brakes are fading when:
If you must make an emergency stop, you should brake so you:
When the air system is low ________.
What negatively affects the braking power of a spring brake?
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
Which braking system applies and releases the parking brakes when you use the parking brake control?
What is a \"Wig Wag\"
If your truck has a dual air brake system, and one of the systems is low on pressure:
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.
When checking the air pressure buildup, pressure should build:
Average stopping distance under normal conditions at 55 mph is:
In order to make contact with the brake drum, the brake pads and linings are pushed outward by the:
All of the following apply if the low air pressure warning signal does not work except:
At what level will the low air warning usually take effect?
The air compressor is connected to the engine through ______.
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:
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
Why do air brakes take longer to stop than hydraulic brakes?
Stab braking should only be used:
If air supply drops when driving, the tractor protection valve ________.
Vehicles with air brakes _________.
What is a wig wag ?
On a long or steep downgrade, how should vehicle speed be primarily controlled?