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 parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
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.
Air tanks need to be drained ______.
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
To test the vehicle's service brakes, move the vehicle:
If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?
If your vehicle has an alcohol evaporator, it is there to:
While applying the brakes, what tells the driver how much air pressure is being used?
Normally during anti-lock braking, the driver:
When you release the brakes and reduce the air pressure what makes up for that air loss?
When does the air compressor governor allow air to start pumping?
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
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.
After the initial pressure drop, air leakage for single vehicles should be less than:
Which of these is NOT a proper time to apply the parking brakes?
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
After the initial pressure drop, air leakage for combination vehicles should be less than:
With air brake vehicles, the parking brakes should be used:
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?
The most common type of foundation brake is?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
During a normal drive, the spring brakes are held back by _____.
What is used to put alcohol into the system and reduce ice risk?
To test the parking brake you should _______.