# 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
Perfect for first-time, renewal applicants
HI CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The most common type of foundation brakes are:
2.
The safety valve discharges automatically at the pressure of:
3.
How far should manual slack adjusters move before they need to be adjusted?
4.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
5.
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?
6.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
7.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
8.
9.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
10.
When parking a vehicle with a modulating control valve ________.
11.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
12.
If you must make an emergency stop, you should brake so you:
13.
What must the air pressure be, at minimum, in both parts of a dual air brake system?
14.
Air braking takes more time than hydraulic braking because:
15.
If the low air pressure warning light comes on, you should:
16.
The air compressor governor controls:
17.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
18.
The most common type of foundation brake is?
19.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
20.
How are brakes designed?
21.
Why should air tanks be drained completely?
22.
What is the purpose of a supply pressure gauge?
23.
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?
24.
Vehicles with air brakes have pressure gauges connected to the _______.
25.
If your brakes are wet, what should you do to dry them quicker?