Free Idaho CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 ID commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
ID CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
An automatic wig wag will rise out of your view when the pressure in your system rises above what psi?
In case of emergency when driving a vehicle equipped with dual parking control valves, you should:
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
Excessive use of the service brakes results in overheating which can lead to:
Under normal conditions, in order to engage the parking brakes the driver should:
Brake fade is caused by:
When performing the controlled braking method for an emergency stop, you are _________.
Generally, air governor cut-in should be at:
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
Air governor cut-out should be at around:
Spring brakes will come on automatically, but the parking brake can also be applied:
If the spring brakes are on, when should you push the brake pedal?
What must the air pressure be, at minimum, in both parts of a dual air brake system?
When checking the air pressure buildup, pressure should build:
If your vehicle has an alcohol evaporator, every day during cold weather you should:
Which of the following helps the stop light switch work?
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
Stop light switches are necessary because ________.
If the air compressor has its own oil supply you should do what before driving?
Vehicles with air brakes _________.
To check the air compressor governor's "cut in" and "cut out" pressures you need to _________.
The spring brakes of a tractor will come on when the air pressure falls within _______.
To prevent too much pressure from building up in the system, what is installed?
In a dual air brake system, one system will typically control the rear brakes, and the other:
What is the function of a safety valve?