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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 Indiana CDL knowledge test. The IN 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 Indiana CDL Manual. Take this IN CDL practice test now to prepare for the actual air brakes test!
1. In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
100 to 120 psi
50 to 75 psi
20 to 45 psi
10 to 20 psi
2. The total stopping distance for vehicles with air brake systems is made up of __ different factors.
3
2
4
5
3. Rough acceleration:
is recommended during long trips.
can cause mechanical damage.
improves gas mileage.
is necessary to warm up the engine.
4. Antifreeze:
helps the engine under hot conditions as well as cold conditions.
doesn't help the engine in any way.
helps the engine only when the temperature is below freezing.
helps the engine only under hot conditions.
5. What is the best way to test the low air pressure warning signal?
step on and off the brake pedal while the engine is running.
pump the brakes until the air pressure drops below 45 psi.
Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
All of the above.
6. If your vehicle catches fire, you should pull over:
near other vehicles.
near trees.
in an open area.
at a service station.
7. Service brakes should:
only be checked by a mechanic.
be checked before each trip.
always be checked before applying the brakes.
All of the above.
8. After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
shutting the engine off so you can hear the brakes.
checking the air brake system pressure gauge for signs of major air loss.
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
All of the above.
9. If the air tanks are not drained:
the air pressure in the tanks is reduced.
your speed must be reduced to 5 MPH below your “safe” speed.
the spring brakes will come on.
the water can freeze in cold weather and cause brake failure.
10. Which of the following is not a way to know when to change gears?
Use engine speed (rpm)
Check that the pressure gauge shows normal oil pressure
Use road speed (mph)
Watch your tachometer
 
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Frequently Asked Questions

For a learner’s permit, you can apply at the age of 15 if you are enrolled in an approved behind-the-wheel training course. Alternatively, if you don’t complete a driver's education course, you must be 16 years of age or older. At the age of 16 years and 90 days, you can obtain a probationary driver's license after you have completed an approved driver education program. For those who have not completed an approved driver education program, the minimum age to obtain a probationary driver's license is 16 years and 270 days. For a standard driver's license, you must be 21 years old.

Generally, you don't schedule an appointment for the BMV written test. Simply choose an Indiana BMV branch and make sure to arrive at least 30 minutes before closing time to complete the exam. However, if you require an interpreter for a language not provided by the BMV, you will need to schedule an appointment online.
Ensure you bring the following documents:

  • Proof of identity. Provide legal proof of the name change if your current name is different due to marriage, adoption, etc.
  • One lawful status document (such as a U.S. birth certificate or U.S. passport).
  • Proof of Social Security Number.
  • Two proofs of residency. If you cannot provide two residency documents, you have the option to submit an Indiana Residency Affidavit.
  • Certificate of driver education course (if applicable).
  • If you are a minor, an adult must sign the back of the application for the Agreement of Financial Liability.


The BMV written test in Indiana is available in various languages, including American Sign Language, French, Korean, Serbian, Arabic, German, Mandarin, Spanish, Burmese, Haitian Creole, Polish, Swahili, Chin, Hindi, Punjabi, Tagalog, Croatian, Japanese, Russian, and Vietnamese. If you speak a language not offered by the BMV, you should arrange for an interpreter yourself and make an appointment online for the exam.

You should read the Indiana Driver’s License Handbook to familiarize yourself with the most common road rules and safe driving practices. Evaluate your knowledge with our free practice tests, or sign up for DMV Premium to unlock exclusive PDF Cheat Sheets!

The Indiana BMV test comprises 50 questions divided into two parts. The first part covers 34 questions about traffic rules and laws, while the second part includes 16 questions about road signs. All questions are multiple-choice, so be sure to read them carefully before providing your answers.

To pass, you are allowed to miss up to 8 questions (6 general questions and 2 traffic sign questions). Stay focused during the exam and take the time to review your answers to minimize errors and pass the test on the first attempt.

Learner's permit restrictions:
  • The use of any telecommunications device is prohibited, unless for calling 911.
  • If you are under 16 years of age and enrolled in a driver education program, you are allowed to drive only under the supervision of a driving instructor seated next to you. Additionally, you may drive with a licensed driver aged 25 or older who is a member of your family or with your spouse who must be at least 21 years old.

Probationary driver's license restrictions:
  • The use of any telecommunications device is prohibited, unless for calling 911.
  • During the first 180 days after obtaining your probationary driver’s license, you are not allowed to drive with passengers unless accompanied by a licensed driver who is at least 25 years old, your spouse who must be at least 21 years old, or a driver instructor.
  • During the first 180 days after obtaining your probationary driver’s license, driving is forbidden between 10 p.m. and 5 a.m. After this period, further restrictions apply:
- from Sunday to Thursday after 11 p.m.
- from Monday to Friday before 5 a.m.
- during the weekend between 1 a.m. and 5 a.m.

Exceptions to these restrictions include situations related to work, school, or religious events, or if you are accompanied by an adult with a valid driver's license aged 25, or your spouse who must be at least 21.


Learner’s permits are valid for two years. You can renew your permit starting 30 days before the expiration date. If you renew it after more than 180 days since your last knowledge test, you will need to retake the exam.
If you fail your BMV written test, you must wait until the next day to make another attempt. Before trying again, carefully study the rules of the road and memorize road signs.

IN CDL Air Brakes Test

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