Free New Mexico CDL Air Brakes Practice Test 2023

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

Our CDL practice tests:
Based on 2021 NM commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
NM CDL Air Brakes Test format:
25 questions
20 correct answers to pass
80% passing score
List of questions
How far should manual slack adjusters move before they need to be adjusted?
At 55 mph on dry pavement, the air brake lag distance is how many feet?
A mechanical device that drops a low air warning into a drivers view is called a:
Your truck has a dual air system and one of the systems loses its pressure. What will happen?
The supply pressure gauge shows how much pressure:
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
When you release the brakes and reduce the air pressure what makes up for that air loss?
Which braking system applies and releases the parking brakes when you use the parking brake control?
When parking a vehicle with a modulating control valve ________.
"Some air brake systems have an alcohol evaporator. What may happen if you don’t keep the proper level of alcohol?"
What happens when your brake drums get very hot?
What must the air pressure be, at minimum, in both parts of a dual air brake system?
The air compressor governor controls:
To test the parking brake, stop the vehicle, put the parking brake on, and:
Pushing the brake pedal down harder __________.
If one air system is very low on pressure _______.
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:
Some vehicles are equipped with a separate air tank used specifically to release the spring brakes in an emergency, called a:
You should use the parking brake _____________.
The belt of a belt-driven air compressor should be ________.
Vehicles with air brakes _________.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
To prevent too much pressure from building up in the system, what is installed?
To test the parking brake you should _______.
What happens when pressure is put on the air brakes?