Free Louisiana CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 LA commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
LA CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
To test air service brakes you should:
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
Your brakes are fading when:
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
To make sure that the spring brakes come on automatically, do all of the following except:
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
Another name for the brake pedal is the "foot valve", or:
What is the purpose of an antilock braking system (ABS)?
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
What is a \"Wig Wag\"
After the initial pressure drop, air leakage for single vehicles should be less than:
Besides heat, another cause of brake fade is:
Which of these is NOT a proper time to apply the parking brakes?
The parking brake should not be used when wet in freezing temperatures, or:
What tells the driver how much air pressure is in the air tanks?
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
Why should you check the brake adjustment often?
Stop light switches are necessary because ________.
How often should alcohol containers be checked during cold weather?
During a normal drive, the spring brakes are held back by _____.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
Vehicles with air brakes have pressure gauges connected to the _______.