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 secure a CDL Doubles/Triples endorsement in Maryland, you need to have a valid Commercial Driver's License (CDL). Then, you must pass the Doubles/Triples endorsement knowledge test administered by the Maryland Motor Vehicle Administration (MVA). Studying the CDL manual and taking practice tests can help prepare for this examination.

To obtain a CDL Doubles/Triples license, you must already hold a Commercial Driver's License (CDL). Then, you need to pass the Doubles/Triples endorsement knowledge test. You're required to understand safety procedures, coupling and uncoupling, inspecting doubles and triples, and pulling double/triple trailers. It's recommended to study the CDL manual and take practice tests for preparation.

While specialized experience or training is not a legal requirement for a CDL Doubles/Triples endorsement, it's highly beneficial. Knowledge of safety procedures, coupling and uncoupling, and inspecting doubles and triples is crucial. Studying the CDL manual and taking practice tests can provide this knowledge. Some applicants may choose to attend a training school for practical experience.

Yes, to obtain a CDL Doubles/Triples endorsement in Maryland, you must pass the Doubles/Triples endorsement knowledge test. This written test covers information specific to driving vehicles with double or triple trailers. Studying the CDL manual and taking practice tests is highly recommended to prepare for this exam.

The CDL Doubles/Triples endorsement test in Maryland is primarily a written knowledge test. It focuses on specific rules and safety aspects of handling multiple trailers, such as coupling and uncoupling, inspecting doubles and triples, and managing the vehicles during various driving conditions. It does not typically include a skills or driving test showcasing specific maneuvers.

No, it is not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Maryland. Operating such vehicles without the appropriate endorsement can result in fines, license suspension, and potentially criminal charges. This endorsement ensures that drivers have the necessary knowledge and skills to safely operate these larger vehicles.

In Maryland, you can append the Doubles/Triples endorsement to your current Commercial Driver's License (CDL). You do not need to initiate a new application for a CDL. However, you will need to pass the Doubles/Triples endorsement knowledge test and pay the required fees to add this endorsement to your existing CDL.

Yes, there are some limitations for drivers holding a CDL Doubles/Triples endorsement in Maryland. For instance, drivers are required to follow specific rules regarding the coupling and uncoupling of trailers, length and weight of the trailers, and speed limits. Moreover, any traffic violation or unsafe driving behavior can result in the suspension or revocation of the endorsement.

In Maryland, a CDL Doubles/Triples endorsement allows drivers to operate vehicles with a Gross Vehicle Weight Rating (GVWR) over 26,001 pounds. However, specific weight and length restrictions can vary based on federal and state regulations. Generally, the maximum length for each trailer is 28.5 feet, and the combined weight (including cargo) cannot exceed 80,000 pounds without a special permit.

Yes, there are specific safety guidelines for driving double/triple trailers with a CDL Doubles/Triples endorsement in Maryland. These include adhering to weight and length restrictions, proper coupling and uncoupling of trailers, maintaining a safe following distance, and understanding the high rollover risk. Additionally, drivers are required to regularly inspect their vehicles and secure all cargo according to regulations.