Air Brakes #2
Air Brakes Endorsement Test | Kentucky 2025 #2 Page 3 of 4
Train for FREE online with our Kentucky 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 KY 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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13 . What color light indicates a vehicle's ABS is not working?
On vehicles with Anti-Lock Braking Systems (ABS), yellow malfunction lamps alert the driver to ABS malfunction.
14 . Failing to drain air tanks could result in:
In an air brake system, the air tanks must be periodically drained to remove accumulations of water and compressor oil. If water is not removed, it could freeze in cold weather and cause brake failure.
15 . What is often found in compressed air?
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
16 . The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
When pressing the brake pedal in a vehicle with S-cam brakes, air will enter the brake chambers. The added air pressure will push out the rods and move slack adjusters, twisting the brake camshafts.
17 . Brakes can get out of adjustment quickly, especially:
Brakes are particularly prone to getting out of adjustment if they are hot. Be sure to routinely check the adjustment of your brakes. For a vehicle to be safely controlled, all brakes must be properly functioning and adjusted.
18 . When operating a vehicle with a dual air brake system, the driver should:
Before driving a vehicle with a dual air brake system, allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems. Watch the air pressure gauges to monitor the pressure levels.
2025 Kentucky | Frequently Asked Questions
In Kentucky, a Commercial Driver's License (CDL) Class B allows holders to operate single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or any such vehicle towing another not exceeding 10,000 pounds. This class typically includes straight trucks, large buses, segmented buses, and dump trucks with small trailers.
A Class B CDL license in Kentucky allows the holder to operate single vehicles with a gross vehicle weight rating of 26,001 pounds or more, or tow a vehicle not exceeding 10,000 pounds. This includes straight trucks, large buses, segmented buses, dump trucks with small trailers, and farm labor vehicles.
To acquire a Class B CDL license in Kentucky, you must be at least 18 years old (21 for interstate driving), have a valid Kentucky driver's license, pass a vision test, and complete a commercial driver’s license application. You'll also need to pass the General Knowledge test and any other knowledge tests for the specific vehicle type, plus a driving skills test.
In Kentucky, you must be at least 18 years old to obtain a Class B Commercial Driver's License (CDL) for intrastate driving (within Kentucky only). However, federal regulations require that you be at least 21 years old to drive a commercial vehicle across state lines, carry hazardous materials, or transport passengers.
While specific endorsements aren't necessary for a Class B CDL, they can provide additional driving privileges. Endorsements in Kentucky include H (Hazardous Materials), N (Tank Vehicles), P (Passenger Vehicles), S (School Buses), and T (Double/Triple Trailers). Each endorsement requires passing a knowledge test, and some require a skills test.
The Class B CDL skills assessment in Kentucky includes three parts: a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving exam. These tests assess your ability to inspect your vehicle before the trip, control the vehicle in various situations like backing, and drive safely in typical traffic situations respectively.
Class B CDL license holders in Kentucky are primarily limited to operating vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 26,000 pounds or vehicles towing another vehicle not exceeding 10,000 pounds. They can't operate Class A vehicles (tractor-trailers) without the appropriate license. Also, without specific endorsements, they can't transport hazardous materials, large numbers of passengers, or school children.
In Kentucky, the written Class B CDL test is primarily offered in English. However, Kentucky does provide the test in Spanish as well. It's important to note though, federal regulations require all CDL holders to have a basic understanding of English to communicate with officials and for safety reasons.
Yes, test accommodations are available in Kentucky for the Class B CDL written exam if you have a disability. You can request accommodations such as extra time, a quiet room, or a reader. To request these, you'll need to provide appropriate documentation of your disability to the Kentucky Division of Driver Licensing.
Yes, if you fail the Class B CDL written test in Kentucky, you can retake it. However, you must wait a minimum of one day before retesting. There is no limit to the number of times you can retake the test, but keep in mind that each attempt requires a new testing fee.