# Free Indiana CDL Air Brakes Practice Test 2023

Do you need an Indiana Air Brakes endorsement or an L endorsement for your commercial driving license? The Indiana 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 questions are relevant, all of our CDL practice test packs are based on the Indiana 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 Indiana CDL Practice Test to get ready to pass the Indiana CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 IN commercial driver's license manual
Perfect for first-time, renewal applicants
IN CDL Air Brakes Test format:
25 questions
80% passing score
List of questions
1.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
2.
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
3.
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
4.
A mechanical device that drops a low air warning into a drivers view is called a:
5.
Total stopping distance for air brakes is longer than that for hydraulic brakes due to ______ distance.
6.
7.
The supply pressure gauge shows how much pressure:
8.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
9.
When performing the controlled braking method for an emergency stop, you are _________.
10.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
11.
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
12.
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
13.
If the air compressor should develop a leak, what keeps the air in the tanks?
14.
The safety valve reduces pressure at ___ psi.
15.
If the low air pressure warning light comes on, you should:
16.
In a dual air brake system, the first system, supplying the rear brakes, is commonly known as the "primary" system, and the other as the:
17.
How should the air leakage rate be tested?
18.
Why should you drain water from compressed air tanks?
19.
The air tanks must be drained because:
20.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
21.
The safety valve in the air compressor tank is set to open at _____.
22.
Brake drums or discs _______.
23.
Vehicles with air brakes _________.
24.
To avoid damaging the brakes, what should you never do while the spring brakes are applied?
25.
What is the function of a safety valve?