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
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.
All air brake equipped vehicles have:
Excessive use of the service brakes results in overheating which can lead to:
A dual air brake system ________.
A mechanical device that drops a low air warning into a drivers view is called a:
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
The ____ shows how much pressure is in the air tanks.
In most newer vehicles, the parking brake control will be:
When using a vehicle with air brakes, the parking needs to be used _______.
Spring brakes will come on automatically, but the parking brake can also be applied:
If the spring brakes are on, when should you push the brake pedal?
When brakes are applied, the brake shoes will press against the:
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
The brake pedal in an air brake system _______.
The service brake system ________.
Brake drums should not have cracks longer than what length?
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
Why should air tanks be drained completely?
On large buses low pressure warning devices usually signal at ______.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
The spring brakes of a tractor will come on when the air pressure falls within _______.