Air Brakes Endorsement Test | North Carolina 2025 #1

Train for FREE online with our North Carolina CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a NC Class A/Class B driver license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . When traveling down a steep downgrade:

The air brakes should be used.

The vehicle should be placed in a low gear and the driver should use engine braking.

The driver should continually downshift instead of using the brakes.

On long and/or steep downgrades, you should primarily use engine braking to control the speed of your vehicle. Use your brakes only as a supplement to this effect.

2 . You should test the low pressure warning signal by:

Turning on the engine and applying the trailer hand brake.

Rapidly pressing and releasing the brake pedal.

Removing wheel chocks and disengaging the parking brake.

It is essential that your low pressure warning light functions properly. After allowing the system to charge, you can test the warning signal by rapidly applying and releasing the brake pedal. This will release air from the braking system and the warning signal should come on when pressure drops to a dangerous level.

3 . Failing to drain the tanks in an air brake system can result in:

Water freezing and causing brake failure.

Squishy brakes.

Too much air collecting.

Too much fuel being carried.

In an air brake system, the air storage tanks must be drained to remove accumulated water and compressor oil. Failing to do this can cause damage. For example, water that has built up in the system could freeze in cold weather and cause brake failure.

4 . Pressing and releasing a brake pedal unnecessarily can:

Release air faster than it can be replaced.

Add more air to the braking system.

Make the brake pedal more sensitive.

Create a loud noise.

In an air brake system, pressing and releasing the brake pedal unnecessarily can release air from the braking system faster than the compressor can replace it.

5 . Brake fading is caused when:

Brakes are not used often enough.

Brakes overheat.

Brakes are too cold.

Brakes are wet.

Using the brakes excessively will cause them to overheat, making them less effective. This is referred to as "fading."

6 . Some air brake systems use alcohol:

To reduce the risk of ice forming in air brake valves.

To make the compressor run more efficiently.

To lubricate parts of the braking system.

To reduce the risk of rust forming on air brake valves.

Some air brake systems contain an alcohol evaporator. This device introduces alcohol into the braking system to inhibit the formation of ice.

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2025 North Carolina | Frequently Asked Questions

To acquire a CDL Tank endorsement in North Carolina, you must first have a valid Commercial Driver's License (CDL). Next, prepare for the Tank endorsement test by studying the relevant section of the NC CDL manual. Schedule and pass the written test at your local DMV. Upon passing, your Tank endorsement will be added to your CDL.

To obtain a CDL Tank license in North Carolina, you must first have a valid Commercial Driver's License (CDL). Then, study the Tank Vehicles section of the NC CDL manual. Following this, you need to pass a written test at a local DMV. Once you pass the test, the Tank endorsement is added to your CDL.

While North Carolina does not specifically require training or experience for a CDL Tank endorsement, it's highly recommended. Studying the Tank Vehicles section of the NC CDL manual is crucial. Training can provide practical knowledge and improve your chances of passing the written test at your local DMV, which is required to obtain the endorsement.

Yes, in North Carolina, you must pass an additional written test to obtain a CDL Tank endorsement. This test covers specific knowledge related to the safe loading, transit, and unloading of liquid and gaseous tank cargo. The material for this test is found in the Tank Vehicles section of the NC CDL manual.

The written test for the CDL Tank endorsement in North Carolina covers topics like inspecting tank vehicles, understanding weight distribution, how to safely drive tanks, handling high center of gravity, managing surge, safe loading and unloading, and handling leaks. These topics are detailed in the Tank Vehicles section of the NC CDL manual.

The CDL Tank endorsement assessment in North Carolina is mainly a written test focused on knowledge rather than specific driving maneuvers. It evaluates your understanding of inspecting tank vehicles, safe driving practices, handling high center of gravity, managing surge, and responding to emergencies. However, during the general CDL road test, you'll demonstrate practical skills like vehicle control and maneuvering.

Yes, drivers with a CDL Tank endorsement in North Carolina must adhere to specific regulations. They can't exceed the weight limit for the vehicle, must follow safety protocols for loading and unloading, and must take precautions to prevent surge. Also, they must report any leaks immediately and comply with hazardous materials regulations if applicable.

No, in North Carolina, a valid Commercial Driver's License (CDL) with a Tank endorsement is required to transport liquid or gas materials. This endorsement ensures that the driver has the necessary skills and knowledge to handle such materials safely and in compliance with state and federal laws.

Yes, a CDL Tank endorsement can be added to your existing CDL. It does not require a fresh application for a new CDL. However, you will need to pass the Tank Vehicle written test. After passing, the endorsement will be added to your current CDL, allowing you to legally operate tank vehicles.

Yes, in North Carolina, handling hazardous materials with a CDL Tank endorsement requires additional training and certification known as the Hazmat endorsement. Drivers must pass a written test on federal and state regulations and undergo a TSA background check. This ensures they are equipped to handle hazardous materials safely and responsibly.