# 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.
The most common type of foundation brakes are:
2.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
3.
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.
4.
The most important thing to do when a low air pressure warning comes on is:
5.
An air brake system is fully charged at what psi?
6.
Emergency stab braking is:
7.
In a controlled braking emergency:
8.
To make sure that the spring brakes come on automatically, do all of the following EXCEPT:
9.
Another name for the brake pedal is the "foot valve", or:
10.
Which braking system applies and releases the parking brakes when you use the parking brake control?
11.
When parking a vehicle with a modulating control valve ________.
12.
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
13.
If the low air warning comes on while you are driving, you should:
14.
If you must make an emergency stop, you should brake so you:
15.
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
16.
The safety valve is set automatically when pressure is:
17.
The level at which the air compressor stops pumping air is:
18.
What must the air pressure be, at minimum, in both parts of a dual air brake system?
19.
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance + _____.
20.
The emergency spring brake release knob is:
21.
The use of brakes on a long and steep downgrade under normal conditions is only a supplement to:
22.
How should the air leakage rate be tested?
23.
The most common type of foundation brake is?
24.
How are brakes designed?
25.
Vehicles with air brakes _________.