Air Brakes #1
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.
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1 . When traveling down a steep downgrade:
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:
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:
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:
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 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 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 secure a Doubles/Triples endorsement in North Carolina, you must first have a Commercial Driver's License (CDL). Next, you'll need to pass the Doubles and Triples Endorsement Test, which covers coupling and uncoupling, inspecting doubles and triples, and handling. The written test can be taken at your local DMV. Study materials are available online or at the DMV.
To obtain a CDL Doubles/Triples license, you must first have a Commercial Driver's License (CDL). Then, study for and pass the Doubles/Triples Endorsement Test, which covers topics such as coupling and uncoupling, inspecting doubles and triples, and handling. You can take the test at your local DMV. The DMV provides study materials.
While North Carolina does not explicitly require specialized experience or training for a CDL Doubles/Triples endorsement, it is highly recommended. The endorsement test covers specific knowledge areas, such as coupling and uncoupling, inspecting doubles and triples, and handling. Many applicants find that training programs or courses help them prepare for the test and handle these types of vehicles safely.
Yes, to acquire a CDL Doubles/Triples endorsement in North Carolina, you must pass a specific Doubles/Triples Endorsement written examination. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and the proper procedures to handle these types of vehicles. It's an additional test to the standard CDL written exam.
In North Carolina, the CDL Doubles/Triples endorsement does not require a specific skills or maneuvers test. However, the written test covers areas like coupling and uncoupling, inspecting doubles and triples, and handling. It's important to understand these concepts thoroughly. Still, you won't need to physically demonstrate these skills for the endorsement.
No, it's not permissible. In North Carolina, like in all states, a CDL Doubles/Triples endorsement is required to legally operate double or triple trailers. Driving these types of vehicles without the proper endorsement can lead to severe penalties, including fines and potential suspension of your commercial driver's license.
You can add the Doubles/Triples endorsement to your existing Commercial Driver's License (CDL) in North Carolina. You don't need to start a new application for a CDL. However, you must pass the Doubles/Triples endorsement written test and pay the required fee to add this endorsement to your current CDL.
Yes, there are certain limitations for drivers with a CDL Doubles/Triples endorsement in North Carolina. Drivers must comply with the state's weight and length restrictions for double and triple trailers. Also, they can only operate vehicles that their specific CDL class allows. Additionally, all federal regulations regarding hours of service and medical fitness apply.
In North Carolina, a double trailer cannot exceed 28.5 feet in length for each trailer and the maximum gross vehicle weight is 80,000 pounds. However, the weight can vary based on the number of axles and axle spacing. For triples, it's usually limited to hauling within 100 air miles of the driver's work reporting location and they cannot exceed 105 feet in total length.
Yes, safety regulations for driving double/triple trailers in North Carolina include conducting pre and post-trip vehicle inspections, maintaining safe following distances, understanding high wind conditions, and proper coupling/uncoupling procedures. Additionally, drivers must comply with all federal regulations such as hours of service and vehicle maintenance. It's crucial to have a valid CDL Doubles/Triples endorsement to operate these vehicles.
