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
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
The stop light switch:
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
When the air system is low ________.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
Why is manually adjusting automatic slack adjusters dangerous?
If your truck has a dual air brake system, and one of the systems is low on pressure:
All of the following are factors in total stopping distance except:
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.
The emergency spring brake release knob is:
In case of emergency stops, drivers should:
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
How should the air leakage rate be tested?
In dual air systems, how long should it take air pressure to build 85 to 100 psi?
Brake drums should not have cracks longer than what length?
The air compressor is connected to the engine through ______.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
The safety valve in the air compressor tank is set to open at _____.
You should use the parking brake _____________.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?
To prevent too much pressure from building up in the system, what is installed?
Water and oil _______.