Louisiana Air Brakes Test

About the Louisiana Air Brakes Test

You’ve got to know air brakes inside and out to drive in Louisiana. Our highways like I-10 and I-12 see heavy truck traffic around Baton Rouge and New Orleans. You’ll face sudden downpours and swampy humidity that can affect your brake components. That’s why Louisiana’s CDL test focuses on real-world air brake safety.

We’ve designed this practice test to match the Louisiana DMV’s actual air brakes exam. You’ll answer 25 questions covering systems, components, and emergency procedures. You need an 80% score to pass. Don’t worry – you can retake it as many times as you want.

Each question here comes from the Louisiana Commercial Driver’s License Manual. You’ll learn about air compressor governors, brake lag, and how to inspect your system before every trip. We also include tips for Louisiana’s unique conditions – like avoiding brake fade on long downhill stretches in the northern part of the state.

Ready to start? Take the test now and see where you stand. You’ll get instant feedback and explanations for each answer. No sign-up required.

What This Test Covers

• Air compressor and governor – keeps your brakes working in Louisiana’s stop-and-go traffic on I-10.
• Brake chamber and slack adjuster – critical for proper braking on wet roads during hurricane season.
• Air brake system inspections – required daily; skip this and you’ll fail the Louisiana CDL skills test.
• Emergency braking and stopping distance – longer on Louisiana’s flat, wet highways like I-55.
• Low air pressure warnings – you must know how to react when your buzzer sounds in heavy New Orleans traffic.
• Spring brakes and parking brakes – essential for parking on sloped ramps at Louisiana truck stops.

Study Tips

Study the Louisiana CDL Manual’s air brakes chapter cover to cover. Don’t skip the diagrams. The OMV tests you on component identification. Practice with our test until you get 90% every time.

Book your appointment online at expresslane.org. Walk-ins are rare. Bring your current license and medical certificate. The air brakes test is part of the written exam – you must pass it separately if you want the endorsement on your CDL.

Louisiana DMV Information

Louisiana CDL air brakes tests are taken at OMV offices across the state. Major locations include Baton Rouge, New Orleans, Lafayette, and Shreveport. You can schedule your written test appointment through the ExpressLane system – no walk-ins accepted at most offices.

The written test costs $10 per endorsement attempt. You’ll need to pay with cash or credit card. If you fail, you can retake it the next business day. Bring your learner’s permit and proof of residency.

Remember: the air brakes endorsement requires a separate skills test on a vehicle with air brakes. You must pass that too. Our practice test prepares you for the written part only.

Frequently Asked Questions

Related Resources

Other Louisiana CDL Practice Tests

Test Details

• State: Louisiana
• Test: Air Brakes Test
• Questions: 118
• Passing Score: 80%
• Time Limit: 30 minutes
• Cost: Free

Need ELDT Training?

If you're getting your first CDL, you need ELDT theory training before your skills test.