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
Air brakes consist of ________.
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ below the posted speed and release your brake.
Parking or emergency brakes of trucks and buses can be legally held on by ____ pressure.
The most important thing to do when a low air pressure warning comes on is:
Under normal conditions, in order to engage the parking brakes the driver should:
In a controlled braking emergency:
The brake system that applies and releases the brakes when the driver uses the brake pedal is the ________ brake system.
To make sure that the spring brakes come on automatically, do all of the following except:
What type of brakes pushes a wedge between the ends of two brake shoes to stop the vehicle?
What is the purpose of an antilock braking system (ABS)?
Some vehicles are equipped with a control allowing you to apply the spring brakes gradually, called a:
To check the free play of manual slack adjusters of S-cam brakes, you should park on:
When checking the air pressure buildup, pressure should build:
After the initial pressure drop, air leakage for single vehicles should be less than:
After the initial pressure drop, air leakage for combination vehicles should be less than:
The trailer air supply knob is usually:
Why does a heavily loaded vehicle need a longer distance to stop?
Brake drums should not have cracks longer than what length?
The most common type of foundation brake is?
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
When driving an older vehicle that has a manual front brake limiting valve, drivers should:
The parking brake should be used:
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
On a long or steep downgrade, how should vehicle speed be primarily controlled?
Manual air tank drains require: