CDL AIR BRAKES PRACTICE TEST - LOUISIANA

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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 Louisiana CDL knowledge test. The LA 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 Louisiana CDL Manual. Take this LA CDL practice test now to prepare for the actual air brakes test!
1. You should drain your air tanks:
at the beginning of each trip.
at the end of each working day.
every month.
at least once a week.
2. During a trip you should check:
mirrors.
temperature gauges.
pressure gauges.
All of the above.
3. Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
It takes one half second or more for the air to flow through the lines to the brakes.
Air brakes use different brake drums.
Stopping distance for vehicles with air brakes is made up of six different factors.
When driving vehicles with air brakes, the average perception distance increases from 400 feet to 2200 feet.
4. Brake fade results from, and is affected by:
brakes out of adjustment.
excessive heat caused by not relying on the engine braking effect.
excessive heat caused by using the brakes too much.
All of the above.
5. Which of the following statements is true?
Under-inflated tires will NOT cause a vehicle fire.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
Poor cargo ventilation is a common cause of fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
6. The air compressor governor controls:
the speed of the air compressor.
the air pressure applied to the brakes.
when air tank pressure falls below the “cut-out” level.
when the air compressor will pump air into the air storage tanks.
7. Emergency brakes are:
not required on buses.
required on all vehicles.
not required on doubles.
not required on commercial vehicles with air brakes.
8. If you must make an emergency stop, you should:
use the hand brake before the brake pedal.
brake in a way that will keep your vehicle in a straight line.
apply the brakes as hard as you can to lock them.
None of the above.
9. When you make a quick lane change, the crack-the-whip effect can:
improve your traction.
make it harder to turn without skidding.
the trailer to swing wide to the left.
turn the trailer over.
10. If the spring brakes do not release when you push the trailer air supply control, you should:
pump the brakes.
rev or lug the engine.
check the electrical cables.
check the air line connections.
 
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Frequently Asked Questions

If you are 15 or 16 years old, you must adhere to the stages of the Graduated Driver Licensing (GDL) Program:
  • Stage 1 ? for a learner’s permit, you must be at least 15 years old.
  • Stage 2 ? for an intermediate license, you must be at least 16 years old and have held the permit for 6 months.
  • Stage 3 ? for a full license (class E), you must have completed stages 1 and 2 or be at least 17 years old.

To take the Louisiana DMV written test, contact a driver education provider or the Office of Motor Vehicles. Before you go, check if your chosen Louisiana OMV offers the permit tests and the available business hours.
If you are a first time applicant, you'll need:
  • One primary document, such as a birth certificate or passport.
  • Proof of your Social Security Number.
  • An additional form of identification (e.g., Louisiana college or university ID, employment ID card, etc.).
  • Proof of residence.
If you are a minor, a parent or legal guardian must accompany you to sign the application.


If you have difficulty understanding English, you can have a translator assist you during the knowledge test. However, it is advisable to have a basic understanding of English since road signs are always in English.

It is recommended to thoroughly read the Louisiana Driver's Handbook at least three times to acquire a comprehensive understanding of the road rules. Verify your knowledge with our free practice tests or sign up for DMV Premium to access additional resources. Once you are satisfied with your score, you are ready for the exam.

The DMV written test contains 40 questions regarding road signs, safe driving practices, and road rules. All questions are multiple-choice, so be sure to carefully read them before providing your answers.

You must answer at least 32 questions correctly, and you can miss up to 8 questions to pass the test. The minimum score required to succeed in the exam is 80%. Take your time during the exam to make sure you understand the questions well.

Under the Graduated Licensing Program, teens face specific restrictions.

Drivers with a learner’s permit:
  • Must drive with a licensed adult who is at least 21 years old, or a licensed family member who is at least 18 years old.
  • Cannot use a cell phone.

Drivers with an intermediate license:
  • Are restricted from driving between 11 p.m. and 5 a.m. unless accompanied by a licensed adult who is at least 21 years old or a licensed family member who is at least 18 years old.
  • Can only transport one passenger under 21 (excluding siblings) unless supervised by a licensed adult aged 21 or older between 6 p.m. and 5 a.m.
  • Cannot use a cell phone, except for emergencies. 

If you fail your DMV written test at a driver education provider, the policies vary depending on the driving school. Some may require you to pay for a retest, while others may include multiple attempts in the course. Be sure to check the specific rules of the driving school you are attending. If you fail the permit test at the Office of Motor Vehicles, you have the opportunity to retake the exam once on the same day, provided there is enough time available.

LA CDL Air Brakes Test

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