# Free Montana CDL Air Brakes Practice Test 2023

Do you need an Air Brakes endorsement or an L endorsement for your commercial driving license? The Montana 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 Montana 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 Montana CDL Practice Test to get ready to pass the Montana CDL Air Brake Test now.

Our CDL practice tests:
Based on 2021 MT commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
MT CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
1.
The safety valve discharges automatically at the pressure of:
2.
An air compressor can be cooled by _______.
3.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
4.
The stop light switch:
5.
The spring brakes used on the chambers in a straight truck will bring you to a stop when air pressure drops below ___ psi.
6.
Brake fade is caused by:
7.
In ideal conditions a truck or bus with air brakes going at 55 mph would require the stopping distance of how many feet?
8.
The low air pressure warning signal indicates:
9.
Which braking system applies and releases the parking brakes when you use the parking brake control?
10.
When using a vehicle with air brakes, the parking needs to be used _______.
11.
If the spring brakes are on, when should you push the brake pedal?
12.
When checking the air pressure buildup, pressure should build:
13.
After the initial pressure drop, air leakage for single vehicles should be less than:
14.
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
15.
All of the following apply if the low air pressure warning signal does not work except:
16.
When inspecting the air brake system, what particular item in the engine compartment should the driver pay specific attention to?
17.
Why should you drain water from compressed air tanks?
18.
The safety valve in the air compressor tank is set to open at _____.
19.
Brake drums or discs _______.
20.
How often should alcohol containers be checked during cold weather?
21.
The parking brake should be used:
22.
The governor stops the compressor from pumping air at:
23.
A warning to drivers behind you that the air brakes have been applied is the:
24.
What is the purpose of an air storage tank?
25.
What is the function of a safety valve?