# Free Connecticut CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The CDL Air Brake 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 Connecticut CDL Practice test questions are based on the CT 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 free CDL Practice Test to get ready to pass the Connecticut CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 CT commercial driver's license manual
Perfect for first-time, renewal applicants
CT CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
2.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
3.
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
4.
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?
5.
If your vehicle has an alcohol evaporator, it is there to:
6.
Excessive heat caused by using your brakes too often can also cause:
7.
In most newer vehicles, the parking brake control will be:
8.
When your brake's main air pressure is lost ________.
9.
When does the air compressor governor allow air to start pumping?
10.
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
11.
If the spring brakes are on, when should you push the brake pedal?
12.
13.
The S-cam:
14.
Under normal braking conditions, the vehicle ______.
15.
Compared to hydraulic brakes, air brakes add how much distance to an average 55 mph stop?
16.
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
17.
The brake pedal in an air brake system _______.
18.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
19.
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
20.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
21.
Why should air tanks be drained completely?
22.
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
23.
What is the purpose of a supply pressure gauge?
24.
A warning to drivers behind you that the air brakes have been applied is the:
25.
Typically, at what psi does the air compressor governor stop the compressor from pumping air?