Air Brakes Endorsement Test | Maryland 2025 #1

Train for FREE online with our Maryland 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 MD 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 . Brake fade is a result of:

Brakes being exposed to sunlight.

Brakes being exposed to moisture.

Excessive use of the brakes.

If brakes are overused, they can become too hot. This overheating causes them to fade, making them less effective at slowing the vehicle.

2 . Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.

Spring brakes

Parking brakes

Air brakes

Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure levels drop to an unsafe level, the parking brake valve should pop out and spring brakes should come on.

3 . 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.

4 . To use the stab braking method in an emergency situation, you should:

Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.

Apply the brakes about halfway, but keep the wheels rolling.

Fully apply the brakes, let the wheels lock up, and hold the brake pedal down, keeping the wheels locked until the vehicle stops.

Apply the emergency brake.

The stab braking method for emergency stops involves fully applying the brakes until they lock up. The brakes are then released until the wheels start rolling, then the process is repeated.

5 . What is removed when an air tank is drained?

Water and oil

Ammonia

Wood

Chlorine

In an air brake system, the air storage tanks are equipped with drains to allow water and compressor oil to be removed. The water and oil can damage the brakes if left to accumulate in the system.

6 . A low air pressure warning signal:

Is not recommended on vehicles with air brakes.

Is required on vehicles with air brakes.

Is optional on vehicles with air brakes.

Any vehicle with air brakes must be equipped with a low air pressure warning signal.

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2025 Maryland | Frequently Asked Questions

To acquire a CDL Tank endorsement in Maryland, you must first have a Commercial Driver's License (CDL). Next, study for the Tank endorsement test using Maryland's CDL manual. Once ready, schedule and pass the written test at your local Motor Vehicle Administration (MVA) office. Upon passing, the Tank endorsement will be added to your CDL.

To obtain a Commercial Driver's License (CDL) Tank endorsement in Maryland, you must have a valid CDL. You then need to pass the Tank Vehicle endorsement written test, which covers topics like inspecting tank vehicles, safe driving, and handling emergencies. The Maryland Motor Vehicle Administration (MVA) provides study materials for the test.

While Maryland does not specifically require training or experience to obtain a CDL Tank endorsement, passing the Tank Vehicle endorsement written test is mandatory. Gaining practical experience or undergoing training can be beneficial for understanding the nuances of operating a tank vehicle and could improve your chances of passing the test.

Yes, an additional written test is required to obtain a CDL Tank endorsement in Maryland. This test covers the specifics of operating a tank vehicle, including inspection, safe driving, and handling emergencies. It is separate from the general CDL written test and must be passed to receive the endorsement.

The written test for the CDL Tank endorsement in Maryland includes subjects such as the proper loading and unloading of cargo, the safe operation of tank vehicles, emergency procedures, and the recognition of potential hazards. Additionally, it covers topics like tank vehicle inspection, controlling liquid surge, and understanding the effects of liquid movement during acceleration, braking, and turning.

The CDL Tank endorsement written test assesses knowledge on specific aspects of operating a tank vehicle. These include understanding the tank's structure, inspecting the vehicle before and after trips, safe driving techniques, knowledge about high center of gravity, managing surge, handling emergencies, and awareness of different liquids and gases that may be transported.

Drivers with a CDL Tank endorsement are subject to federal and state regulations regarding hours of service, vehicle maintenance, and reporting. They must also adhere to specific safety procedures when loading, unloading, and transporting hazardous materials. Furthermore, they are required to maintain a clean driving record and may face restrictions based on health conditions.

No, liquid or gas materials cannot be transported without a valid CDL Tank endorsement. This endorsement is specifically required for commercial drivers who operate tank vehicles that transport liquid or gaseous materials. Driving such vehicles without the proper endorsement is illegal and can result in severe penalties, including fines and suspension of the driver's Commercial Driver's License (CDL).

The CDL Tank endorsement can be added to your current commercial driver's license. You don't need to apply for a fresh license. However, you will need to pass the Tank Vehicle endorsement written test and pay the required fee to add this endorsement to your CDL. Always check with your local DMV for specific requirements.

Yes, to handle hazardous materials with a CDL Tank endorsement, drivers must also obtain a HazMat endorsement. This involves passing a written test, submitting to a TSA background check, and paying an additional fee. Drivers must follow strict safety protocols when handling these materials and are subject to regular inspections.