# 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.
When inspecting air brakes:
2.
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
3.
A low air pressure warning signal is ________.
4.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
5.
Under normal conditions, in order to engage the parking brakes the driver should:
6.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
7.
A mechanical device that drops a low air warning into a drivers view is called a:
8.
The type of brakes that clamp the rotor between the brake shoes is:
9.
When testing air leakage rates for single vehicles, initial loss rate should be less than:
10.
Generally, air governor cut-in should be at:
11.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
12.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
13.
Air braking takes more time than hydraulic braking because:
14.
The air compressor governor controls:
15.
In case of emergency stops, drivers should:
16.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
17.
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
18.
The service brake system ________.
19.
On newer vehicles what color is the parking brake knob?
20.
If one air system is very low on pressure _______.
21.
At minimum, a dual air system should build up to what psi in the primary and secondary systems?
22.
The air tanks must be drained because:
23.
Why should you drain water from compressed air tanks?
24.
What does the air compressor governor control?
25.
Vehicles without automatic air tank drains need to be checked manually to remove ________?