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
A driver needs to be able to see a warning when the air pressure in the service air tanks falls below ______.
Air brakes consist of ________.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:
Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system, what should you do?
The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi.
The most important thing to do when a low air pressure warning comes on is:
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
In case of a low air situation, the spring brakes should come on at:
What negatively affects the braking power of a spring brake?
When you release the brakes and reduce the air pressure what makes up for that air loss?
What happens when your brake drums get very hot?
It is not safe to drive a vehicle that has brake drums with cracks that are longer than _____ of the width of the friction area.
The parking brake knob is usually:
The level at which the air compressor stops pumping air is:
Total stopping distance with air brakes is Perception distance + Braking Distance + Brake Lag Distance +:
Average stopping distance under normal conditions at 55 mph is:
A device that limits the amount of air provided to the front brakes is a:
Repeatedly partially increasing and pressing the brake pedal may result in:
Why should you check the brake adjustment often?
Brake drums should not have cracks longer than what length?
In a dual air brake system, if the air pressure in one part of the system drops enough to set off the low air warning:
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
The braking power of the spring brakes ______.
On large buses low pressure warning devices usually signal at ______.
What happens when pressure is put on the air brakes?