Air Brakes #1
Air Brakes Endorsement Test | Delaware 2025 #1 Page 4 of 4
Train for FREE online with our Delaware 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 DE 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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19 . 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.
20 . If the air pressure warning light comes on, you should:
Safely exit the roadway and stop.
If the air pressure warning light or buzzer comes on while you are driving, you should immediately stop and safely park the vehicle. This warning signal indicates that there is a problem in the air brake system that needs to be fixed.
21 . 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."
22 . When the brake pedal is pushed down, air brakes work:
Only if it is warm outside.
Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.
23 . Truck tractors with air brakes built on or after March 1, 1997 must have:
A rear back-up camera.
Truck tractors with air brakes built on or after March 1, 1997 must be equipped with Anti-Lock Braking Systems (ABS).
24 . Most heavy-duty vehicles use:
Quadruple air brake systems.
Most heavy-duty vehicles use dual air brake systems, in which there are two separate braking systems operated by a single set of controls. Each system operates the brakes on different axles.
25 . If the safety relief valve in the air brake system releases air:
An air brake system has a safety relief valve, which releases air from the tanks if the pressure gets too high. If the valve must operate, something in the system is wrong and should be addressed by a mechanic.
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2025 Delaware | Frequently Asked Questions
In Delaware, a Commercial Driver's License (CDL) Class B allows the holder to operate vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 26,000 pounds, or towing vehicles not in excess of 10,000 pounds. This includes buses, dump trucks, tow trucks, delivery trucks and garbage trucks. Endorsements may be required for certain vehicles such as school buses.
A Class B Commercial Driver's License (CDL) in Delaware allows the holder to operate vehicles like buses, dump trucks, tow trucks, delivery trucks, and garbage trucks. These vehicles have a Gross Vehicle Weight Rating (GVWR) of over 26,000 pounds or are towing vehicles not exceeding 10,000 pounds. Certain vehicles may require additional endorsements.
To acquire a Class B CDL license in Delaware, the applicant must be at least 18 years old (21 for interstate driving), possess a valid Delaware driver's license, and pass a vision test. They must also pass written knowledge tests, a pre-trip vehicle inspection test, and a road skills test. A Department of Transportation (DOT) medical certification may also be required.
To qualify for a Class B Commercial Driver's License (CDL) in Delaware, you must be at least 18 years old. However, you must be 21 years or older if you plan to drive commercial vehicles across state lines (interstate driving) or transport hazardous materials.
While endorsements aren't necessary to obtain a Class B CDL license, they can expand your job opportunities. Endorsements certify you to drive certain types of vehicles or transport specific items. For example, a passenger endorsement allows you to drive a bus, and a hazardous materials endorsement permits you to transport hazardous goods. Endorsements require additional tests.
The Class B CDL skills test in Delaware includes a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving test. These assess your ability to inspect your vehicle before the trip, control the vehicle in various situations like turning and parking, and safely drive on public roads, adhering to traffic laws.
Class B CDL license holders in Delaware are restricted to driving single vehicles with a gross vehicle weight rating (GVWR) of 26,001 lbs. or more, or towing a vehicle not exceeding 10,000 lbs. GVWR. They cannot operate Class A combination vehicles. Additional endorsements may be required for certain vehicles like school buses or tank trucks.
In Delaware, the written Class B CDL test is primarily offered in English. However, some testing centers may provide the test in Spanish. It's recommended to contact your local DMV to confirm language availability. It's important to note that all drivers must be able to understand and read English to comply with federal regulations.
Yes, Delaware offers accommodations for the Class B CDL written exam due to disability. You can request for special arrangements by contacting the Delaware Division of Motor Vehicles (DMV). They will guide you through the process. The accommodation could include extra time, a quiet room, or a reader, depending on your specific needs.
If you fail the Class B CDL written test in Delaware, you can retake it. However, you must wait at least 2 business days before attempting the test again. If you fail three times, you will need to wait 30 days before your next attempt. Each test attempt requires a separate fee.
