Free North Dakota CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 ND commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
ND CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
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?
"A slack adjuster’s free play needs to be adjusted if it is more than about ______ when you pull hard on it."
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
A low pressure warning signal could be __________.
An air brake system is fully charged at what psi?
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?
To make sure that the spring brakes come on automatically, do all of the following except:
Where is the modulating control valve located on some vehicles?
The type of brakes that clamp the rotor between the brake shoes is:
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
If the low air warning comes on while you are driving, you should:
When brakes are applied, the brake shoes will press against the:
All of the following are factors in total stopping distance except:
If you are driving down a steep downgrade and have reached your safe speed of 40 mph, you would apply the service brake until your speed dropped to ____ mph.
What tells the driver how much air pressure is in the air tanks?
Pressing and releasing the brake pedal unnecessarily:
Repeatedly partially increasing and pressing the brake pedal may result in:
In case of air pressure loss, a mechanical means of preventing the vehicle from moving is called:
All of the following apply if the low air pressure warning signal does not work except:
Controlled braking is only possible _________.
Stop light switches are necessary because ________.
What is used to put alcohol into the system and reduce ice risk?
The spring brakes of a tractor will come on when the air pressure falls within _______.
Manual air tank drains require:
What is the function of a safety valve?