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
The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
A dual air brake system ________.
The most important thing to do when a low air pressure warning comes on is:
Why drain water from compressed air tanks?
The 3 individual systems of the air brakes are the service brakes, emergency brake, and:
On a long or steep downgrade, the foot brakes should be used:
While applying the brakes, what tells the driver how much air pressure is being used?
When you need to apply more pressure to help your brakes work normally effectively, this means that your brakes are fading. Which of the following can cause fading brakes?
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?
When parking a vehicle with a modulating control valve ________.
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:
The level at which the air compressor stops pumping air is:
After the initial pressure drop, air leakage for single vehicles should be less than:
A device that limits the amount of air provided to the front brakes is a:
With air brake vehicles, the parking brakes should be used:
Brake drums (or discs) must not have cracks longer than ____ the width of the friction area.
You should avoid using the parking brake when _______.
Why should you check the brake adjustment often?
Brake linings should not be _______.
If air supply drops when driving, the tractor protection valve ________.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
What brake system uses part of the service and parking brake systems to stop the vehicle in the event of a brake system failure?
The parking brake should be used:
A warning to drivers behind you that the air brakes have been applied is the: