North Dakota CDL Air Brakes Test (2025)

1. Empty trucks have the best braking. True or False?

False.
True.
It depends on the cargo.
It depends on the truck.

2. The safety relief valve is located:

in the front brake.
on the dashboard.
on each end of the vehicle's axles.
in the first tank the air compressor pumps air to.

3. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:

worn.
tight.
cracked.
loose.

4. To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?

If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
All trucks have air brakes.
If you don't pass the air brakes test, you can't get a CDL.
If you don't, you will only receive a CDL permit.

5. The low pressure warning signal will generally activate when the air pressure falls between:

80–85 psi.
85–100 psi.
55–75 psi.
30–35 psi.

6. If the air tanks are not drained:

your speed must be reduced to 5 MPH below your “safe” speed.
the water can freeze in cold weather and cause brake failure.
the air pressure in the tanks is reduced.
the spring brakes will come on.

7. _________ must have a low air pressure warning signal.

All vehicles with air brakes
Vehicles with air brakes built after 2010
Vehicles with air brakes built after 2005
Only vehicles with air brakes built before 2015

8. When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?

Never.
When you are conducting your pre-trip inspection.
When the tank pressure falls to the "cut-in" pressure.
Only while you are taking a rest break.

9. Air tanks must be drained because:

if one air system is low on pressure, the rear brakes will not be operating fully.
if you don't drain the tanks yourself, your battery fluid may drain out.
when you push the brake pedal, air is let into each brake chamber.
compressed air usually has some water in it. The water can freeze in cold weather and cause brake failure.

10. With brake drums, if brakes become too hot:

your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
The brakes may stop working
the air compressor will kick on to cool the brakes.

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Frequently Asked Questions

In North Dakota, teens must follow the three steps of the Graduated Licensing Program to obtain a class D driver license:

For a learner’s permit, you must be at least 14 years old.
For an intermediate license, you must either hold the permit for one year or be 16 years old and have held the permit for at least six months.
For a standard license, you must be at least 16 years old and complete a road test.

You can visit a North Dakota driver license office or take the DMV written test at home using KnowTo Drive, the official knowledge testing platform. For this second option, if you are under 18, you must be supervised by a parent/legal guardian with a valid driver's license. After passing the exam, you are still required to visit the DOT to validate your identity and complete the testing process.

You'll need to bring the following documents:

Completed application (if you are under 18, a parent/legal guardian must sign your application and assume financial liability).
Proof of identification (if your name has changed, please provide proof of your current legal name).
Proof of Social Security Number.
Proof of North Dakota residence (two documents).

Use this checklist to ensure you have all the required documents before your appointment.

You can take the DMV written test in Arabic, Chinese, English, French, Nepali, Russian, Serbo-Croatian, Spanish, Somali, Swahili, Turkish, Vietnamese, Pashto, and Dari. Additionally, automated American Sign Language and audio testing are provided at the following offices: Fargo, Jamestown, Bismarck, Dickinson, Williston, Minot, Devils Lake, and Grand Forks.

To prepare for the DMV written test, you can refer to the official North Dakota Driver's Handbook. The manual covers various information about road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. Study carefully the different sections and test your knowledge with our free practice tests!

The DMV written test has 25 questions, and you have 60 minutes to answer them. The questions cover different topics about road rules and safe driving practices.

You are allowed up to 5 wrong answers. This means that the passing score is 80%. It's important to stay focused during the exam and take the time to read the questions carefully to minimize errors and pass the DMV written test on the first attempt.

For new drivers in North Dakota, various restrictions apply:

With a learner's permit, you must drive under the supervision of a parent/guardian or an adult aged 18 or older who has a minimum of three years of driving experience, seated beside you.
With an intermediate license, if you are under 16, you can drive alone except between sunset or 9 p.m. and 5 a.m. or for work, school, and religious activities.

Additionally, all drivers under 21 are considered legally under the influence of alcohol if their blood alcohol content (BAC) is .02 or greater. For those under 18, using cell phones while driving is forbidden except during emergencies.

You must wait 24 hours before retaking the DMV written test after a failure. You have 5 attempts within a year, but each time you need to pay another fee. If you leave the testing area early before completing the exam or if you bring cell phones or electronic devices, you may be disqualified. Additionally, attempting to cheat during an online test will result in automatic failure.

CDL AIR BRAKES PRACTICE TEST - NORTH DAKOTA

Frequently Asked Questions

1 How old do you have to be to get a driver's license in North Dakota?

2 How can you schedule the DMV test?

3 What documents do you need to apply for a driver’s license in North Dakota?

4 Is the DMV test only provided in English?

5 How can you prepare for the North Dakota DMV test?

6 How many questions are on the DMV test in North Dakota?

7 How many questions can you miss on the North Dakota DMV test?

8 What are the restrictions for new drivers in North Dakota?

9 What happens if you fail your DMV test?

ND CDL Air Brakes Test

Number of questions:	25
Correct answers to pass:	20
Passing score:	80%