Jackson County Central High School

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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Minnesota CDL knowledge test. The MN CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Minnesota CDL Manual. Take this MN CDL practice test now to prepare for the actual air brakes test!
1. If air pressure does not build up fast enough:
the pressure may drop too low during driving.
you should turn the electrical power on and step on and off the brake pedal.
you may be forced to turn off the engine and release the parking brake.
you should put the parking brake on and gently pull against it in a low gear.
2. Your vehicle has air brakes. To stop, you should:
release the accelerator, push in the clutch, and shift to Neutral at the same time.
pull the parking brake control knob out.
push the brake pedal down.
pump the brake pedal 3 times.
3. Trailers built on or after March 1, 1998 are required to be equipped with anti-lock brakes. These trailers will have:
yellow malfunction lamps on the right side.
blue malfunction lamps on the right side.
red malfunction lamps on the left side.
yellow malfunction lamps on the left side.
4. If your truck has automatic transmission, you should downshift:
after entering a curve.
when going down grades.
whenever road conditions allow.
when you need to accelerate.
5. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
the service line valve close.
a mechanical vibration.
a thumping sound.
air escaping from the open valve.
6. When you use your mirrors while driving on the road, you should:
check them quickly.
only use the driver's side mirror.
stare for a long time at the mirror.
avoid checking them regularly.
7. If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?
Once a week.
At least once a month.
At the end of each working day.
Every 4 hours.
8. If your vehicle has dual parking control valves, you can use pressure from a separate tank to:
balance the service brakes while you are parked.
park better.
release the spring brakes so you can move the vehicle in an emergency.
None of the above.
9. Most heavy-duty vehicles use:
air brakes.
solid brakes.
hydraulic brakes.
pressure brakes.
10. ABS:
should only be used on dry roads.
allows you to brake harder.
replaces your normal brakes.
is an addition to your normal brakes.
 
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Frequently Asked Questions

If you're under 18 years old, you must adhere to the age requirements of the Graduated Driver’s Licensing (GDL) Program:
  • Instruction permit ? you must be at least 15 years old.
  • Provisional license ? you must be at least 16 years old and have held your permit for 6 months.
  • Class D driver's license ? you must be at least 18 years old or have held a provisional license for 12 consecutive months without alcohol or crash-related convictions.
If you are 18 years old, you must hold the permit for six months before taking the road test and receiving a full license. If you are 19, a waiting period of only three months is required.

You can schedule an appointment online for your DMV written test. Choose dates and times based on your preferences and the available options at different Minnesota Driver and Vehicle Services (DVS) exam stations. 

You will need to present two primary documents, such as a passport or certificate of birth, or one primary document and one secondary document, such as a Social Security Card. For a list of acceptable documents, check here. Additionally, if you are under 18, you must also bring proof of completing driver education ("Blue Card" or "Pink Card").

At certain exam stations, the test is available in multiple languages, including Hmong, Vietnamese, Somali, Spanish, and Russian. For an American Sign Language (ASL) interpreter, contact Driver and Vehicle Services at (651) 284-1234. If you have difficulty understanding English, oral exams are conducted at the Anoka, Eagan, and downtown Saint Paul/Town Square exam stations. It's important to note that individuals must bring their own interpreter, who should hold a valid Minnesota driver's license.

You need to read the Minnesota Driver's Handbook. The exam covers various topics, including road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. Remember that you cannot use driver's manuals or personal notes, so read the manual carefully and use our free practice tests to test your preparation.

The Minnesota DMV written test consists of 40 multiple-choice or true/false questions about various aspects of driving regulations and road safety. These questions are based on the official manual, so it's important to study it well to maximize your chances of passing the exam.

You can make up to 8 mistakes on the Minnesota DMV written test. To pass, you need to answer at least 32 questions correctly, achieving an 80% accuracy rate. Take your time to read each question accurately.
Individuals under 18 with an instruction permit in Minnesota must drive with a licensed adult who is at least 21. If you are 18 or older, the supervising driver must be at least 18 years old.

After obtaining a license, the following restrictions apply for the first six months:
  • Driving is prohibited between midnight and 5 a.m., unless accompanied by a licensed adult who is at least 25 or for work or school activities.
  • Except for siblings, only one passenger under 20 is permitted without the supervision of a parent or guardian. For the second six months, a maximum of 3 passengers under 20 is allowed.
For drivers under 18, it is illegal to use the cell phone except during emergencies. Until the age of 21, it is also illegal to consume alcohol before driving.

In Minnesota, an instruction permit is valid for two years, with the option to renew it upon the payment of a fee. This ensures you have enough time to practice driving and fulfill the necessary requirements before the road test.

If you do not pass your DMV written test, you'll need to wait until the next business day to retake it. A fee is required for the third and any subsequent attempts. Sign up for DMV Premium and practice with extra tests to pass the exam on the first attempt!

MN CDL Air Brakes Test

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