Free Alabama CDL Air Brakes Practice Test 2022

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

Our CDL practice tests:
Based on 2022 AL commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
AL 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 ______.
Air brakes consist of ________.
Your truck or bus has a dual air brake system. If a low-pressure warning comes on for only one system, what should you do?
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.
In case of a low air situation, the spring brakes should come on at:
An air brake system is fully charged at what psi?
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
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?
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
Why is manually adjusting automatic slack adjusters dangerous?
What must the air pressure be, at minimum, in both parts of a dual air brake system?
Air braking takes more time than hydraulic braking because:
Repeatedly partially increasing and pressing the brake pedal may result in:
Stab braking should only be used:
If air supply drops when driving, the tractor protection valve ________.
Initial air leakage rate for combination vehicles should be:
You should use the parking brake _____________.
To check the air compressor governor's "cut in" and "cut out" pressures you need to _________.
Spring brakes are applied:
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
What does ABS stand for?
To prevent too much pressure from building up in the system, what is installed?
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?