CDL AIR BRAKES PRACTICE TEST - TENNESSEE

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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 Tennessee CDL knowledge test. The TN 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 Tennessee CDL Manual. Take this TN CDL practice test now to prepare for the actual air brakes test!
1. Which of the following is NOT a reason for hydraulic brake failure?
Loss of hydraulic pressure
Stab braking
Brake fade on long hills
All of the above.
2. 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 can't get a CDL.
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, you will only receive a CDL permit.
3. If your vehicle is hydroplaning, you should:
release the accelerator and push in the clutch.
use the brakes to slow down.
accelerate to get through the water as quickly as possible.
None of the above.
4. The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.
emergency
anti-lock
service
parking
5. The Johnson bar is a valve that:
works the trailer brakes.
is installed in the first tank the air compressor pumps air to.
keeps air from going out if the air compressor develops a leak.
reduces the braking pressure to a safe level.
6. The most common foundation brakes found on vehicles with air brakes are the:
wedge brakes.
parking brakes.
disc brakes.
S-cam brakes.
7. When the spring brakes are on, you should push the brake pedal down:
Never.
Only when driving downhill.
Only when driving uphill.
Only when approaching railroad-highway crossings.
8. 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 the end of each working day.
Every 4 hours.
At least once a month.
9. To test the low pressure warning signal, you should:
pump the brakes while your vehicle is running.
shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
manually let the air out of your brakes and see if the signal comes on.
check the air hoses connected to the brake chambers to make sure they aren't cut.
10. Supply pressure gauges tell you:
when the air pressure in the tanks falls below 60 psi.
how much air pressure you are applying to the brakes.
how much pressure is in the air tanks.
when the pressure in the system drops below 60 psi.
 
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Frequently Asked Questions

The age requirements to obtain a class D driver license in Tennessee are established by the four steps of the Graduated Driver License Program:
  • For a learner permit, you must be 15 years old.
  • For an intermediate restricted license, you must be 16 years old and have held the permit for 180 days.
  • For an intermediate unrestricted license, you must be 17 years old and have held an intermediate restricted license for one year.
  • For a regular driver license, you must be 18 years old or have completed high school or obtained a GED.
The Graduated Driver License (GDL) requirements do not apply to emancipated teens (due to active duty military service, marriage, or court order), individuals under 18 who have finished school, or individuals who are 18 or older.

Teenagers between the ages of 15 and 17 can take the DMV written test online under the supervision of a parent or legal guardian registered on the PID (Proctor Identification) App. Alternatively, it is possible to schedule an appointment for permit tests at a Tennessee driver services center. First-time applicants should complete the application before visiting the center.
You'll need to bring the following documents:
  • Proof of U.S. citizenship or legal presence (in case of a name change, documentation must be provided).
  • Two proofs of Tennessee residency (such as a home utility bill or bank statement).
  • Proof of full Social Security Number.
If you are under 18, you'll also need:


The DMV written test is available in English, Spanish, Korean, or Japanese. Additionally, individuals who speak another language may also utilize translation dictionaries. For applicants with learning disabilities or those unable to read, oral tests are available by appointment. In case the applicants are deaf, an interpreter will be provided to assist them during the oral exam.

To prepare for the DMV written test, study the Tennessee Driver's Handbook thoroughly. At the end of each chapter, you’ll find practice questions to help you verify your knowledge of traffic laws. You can also find additional practice tests on DMV Premium to further improve your preparation.

The DMV written test in Tennessee consists of 30 multiple-choice questions based on the driver's manual. These questions cover topics such as road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. You will have 60 minutes to complete the exam.

You can make up to 6 mistakes on the Tennessee DMV written test. To pass, you need to answer at least 24 questions correctly, achieving an 80% accuracy rate. Take your time to read each question accurately.
If you have a learner permit:
  • You must drive with a licensed driver aged 21 or older seated in the front seat.
  • Driving between the hours of 10 p.m. and 6 a.m. is not permitted.

If you have an intermediate restricted license:  
  • You are allowed to have only one passenger in the car with you unless they are licensed drivers aged 21 or older, or if transporting siblings.
  • Driving between 11 p.m. and 6 a.m. is prohibited unless under the supervision of a parent/guardian, or someone designated by the parent/guardian, or for school or work activities. Exceptions also apply for driving to/from hunting or fishing between 4 a.m. and 6 a.m. with a valid hunting or fishing license.


You must wait 1 day before another attempt. However, after a second online failure, you will need to go to a Tennessee driver services center to retake the DMV written test in person. If you were caught cheating, the test will automatically fail and you have to wait 30 days before retaking it.

TN CDL Air Brakes Test

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