Free Alabama CDL Air Brakes Practice Test 2023

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 2021 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
The air compressor stops pumping air at what psi?
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
During normal driving, spring brakes are usually held back by:
A low pressure warning signal could be __________.
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.
On a long or steep downgrade, the foot brakes should be used _______.
In a controlled braking emergency:
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?
What is the purpose of an antilock braking system (ABS)?
When brakes are applied, the brake shoes will press against the:
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
All of the following are factors in total stopping distance, EXCEPT:
If air pressure is not built up within the correct amount of time, then:
To test the parking brake, stop the vehicle, put the parking brake on, and:
All of the following apply if the low air pressure warning signal does not work EXCEPT:
The brake pedal in an air brake system _______.
Why does a heavily loaded vehicle need a longer distance to stop?
How should the air leakage rate be tested?
How does the antilock brake system benefit the driver?
The parking brake should be used _________.
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
Manual air tank drains require:
Water and oil _______.
The warning light and buzzer will come on when the air pressure in either system drops below what psi?