Free Hawaii CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Hawaii 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 Hawaii CDL practice test questions are relevant, all of our practice questions are based on the Hawaii 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 with our CDL practice test to get ready to pass the Hawaii CDL Air Brake Test now. 

Our CDL practice tests:
Based on 2021 HI commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
HI CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
Air brakes consist of ________.
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
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.
The air brake lag distance at 55 mph on dry pavement adds about ____ feet.
Modern air brakes combine three different systems. They are the service, the parking, and the _____ brakes.
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?
A mechanical device that drops a low air warning into a drivers view is called a:
Why drain water from compressed air tanks?
On a long or steep downgrade, the foot brakes should be used:
In a controlled braking emergency:
Your brakes are fading when:
The low air pressure warning signal indicates:
Where is the modulating control valve located on some vehicles?
To stop the vehicle, air brakes systems use:
Normally during anti-lock braking, the driver:
In most newer vehicles, the parking brake control will be:
When brakes are applied, the brake shoes will press against the:
The trailer air supply knob is usually:
You should avoid using the parking brake when _______.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
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?
The spring brakes of a tractor will come on when the air pressure falls within _______.