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
To test air service brakes you should:
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
How far should manual slack adjusters move before they need to be adjusted?
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?
With air brake vehicles, the parking brake should be used:
What negatively affects the braking power of a spring brake?
When you need to depress the brakes harder and harder just to maintain the same speed this means ______.
What happens when your brake drums get very hot?
The safety valve is set automatically when pressure is:
The level at which the air compressor stops pumping air is:
A device that limits the amount of air provided to the front brakes is a:
After the initial pressure drop, air leakage for combination vehicles should be less than:
To test the parking brake, stop the vehicle, put the parking brake on, and:
Brake linings should not be _______.
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
The air tanks must be drained because:
If air supply drops when driving, the tractor protection valve ________.
Stop light switches are necessary because ________.
You should use the parking brake _____________.
The spring brakes of a tractor will come on when the air pressure falls within _______.
Required on all vehicles with air brakes, what tells the driver that air pressure is too low?
Water and oil _______.
What happens when pressure is put on the air brakes?