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
What can legally hold a parking or emergency brake in position for a truck, truck tractor, or bus?
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
Air tanks need to be drained ______.
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.
Excessive heat caused by using your brakes too often can also cause:
Spring brakes will generally come on at:
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
When the engine is off and the parking brake released, a single vehicle air loss rate should be less than ________ psi in one minute.
Another name for the brake pedal is the "foot valve", or:
What should a driver do when the low air pressure warning signal comes on?
Which braking system applies and releases the parking brakes when you use the parking brake control?
The safety valve is set automatically when pressure is:
If your truck has a dual air brake system, and one of the systems is low on pressure:
The emergency spring brake release knob is:
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
Brake drums should not have cracks longer than what length?
If air supply drops when driving, the tractor protection valve ________.
Initial air leakage rate for combination vehicles should be:
Brake drums or discs _______.
Air tanks should be drained:
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
What is a wig wag ?
To prevent too much pressure from building up in the system, what is installed?
What does ABS stand for?
The warning light and buzzer will come on when the air pressure in either system drops below what psi?