Air Brakes #2
Air Brakes Endorsement Test | North Carolina 2025 #2 Page 2 of 4
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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7 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.
It is important to know the maximum air loss rate that is safe for your specific vehicle. A double combination vehicle should have a leakage rate no higher than 4 psi in a minute during an applied leakage test.
8 . The most common type of foundation brake used is the:
P-cam disc brake.
The most common type of foundation brake is an s-cam drum brake.
9 . Where is the safety relief valve usually located?
On the dashboard
An air brake system's safety relief valve is located in the tank that is first to receive air from the compressor.
10 . 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.
11 . 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.
12 . 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.
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2025 North Carolina | Frequently Asked Questions
A CDL Class A license in North Carolina allows the holder to operate any combination of vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 or more pounds, given the Gross Vehicle Weight Rating (GVWR) of the vehicle(s) being towed is over 10,000 pounds. This category typically includes tractor-trailers and truck and trailer combinations.
A Class A CDL (Commercial Driver's License) in North Carolina allows the holder to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, provided the GVWR of the vehicle(s) being towed exceeds 10,000 pounds. This typically includes tractor-trailers, truck and trailer combinations, tank vehicles, and livestock carriers.
To obtain a Class A CDL in North Carolina, you must be at least 18 years old (21 for interstate driving), have a valid North Carolina driver's license, pass a vision test, and obtain a commercial learner's permit by passing written knowledge tests. You'll also need to pass a skills test which includes a pre-trip vehicle inspection, a basic controls test, and a road test.
In North Carolina, you must be at least 18 years old to qualify for a Class A CDL license for intrastate driving (within the state). However, you need to be at least 21 years old if you plan to drive commercially across state lines (interstate driving) or carry hazardous materials.
Specific endorsements aren't required for a Class A CDL license, but they can provide additional driving privileges. For example, endorsements are available for double/triple trailers, tanker vehicles, passenger vehicles, and hazardous materials. Each endorsement requires passing a separate knowledge test and, in some cases, a skills test.
The Class A CDL skills test in North Carolina encompasses three main components: a pre-trip vehicle inspection to assess your ability to determine whether your vehicle is safe for the road, a basic controls test to evaluate your basic maneuvering skills, and a road test to validate your on-road driving ability, including left and right turns, intersections, railway crossings, and various types of roadways.
Yes, Class A CDL license holders in North Carolina may face limitations. These can include restrictions based on medical conditions, such as hearing or vision impairments, or restrictions to operating only automatic transmission vehicles. Additionally, drivers under the age of 21 are restricted to intrastate driving (within North Carolina) only.
In North Carolina, the written Class A CDL test is primarily administered in English, following federal regulations. However, accommodations may be made for applicants with limited English proficiency. It's recommended to contact the North Carolina Division of Motor Vehicles directly to inquire about any available language assistance or resources.
Yes, you can request accommodations for the Class A CDL written test in North Carolina if you have a disability. The North Carolina DMV complies with the Americans with Disabilities Act and offers reasonable accommodations to help individuals with disabilities. You should contact your local DMV office in advance to discuss your needs and arrange appropriate accommodations.
Yes, you can retake the Class A CDL written test in North Carolina if you fail on your first attempt. However, you must wait at least one day before attempting the test again. If you fail three times, you'll need to wait at least 60 days before retesting. Remember, each attempt may require a new testing fee.
