Air Brakes Endorsement Test | Kentucky 2025 #1

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.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . An alcohol evaporator is especially important:

In cold weather.

In hot weather.

In dry weather.

Some air brake systems contain an alcohol evaporator. This evaporator introduces alcohol into the system to help prevent ice from forming in cold weather.

2 . A safety valve is set to open at ____ pounds per square inch (psi).

100

150

200

The safety valve protects air tanks and the rest of an air brake system from accumulating too much air pressure. The safety valve is usually set to open at 150 psi.

3 . What is often found in compressed air?

Water

Cardboard

Brake fluid

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.

4 . During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.

2 psi

4 psi

6 psi

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.

5 . Brakes can get out of adjustment quickly, especially:

If they are hot.

In the winter time.

If they are used frequently.

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.

6 . A driver can rely on front wheel braking to work:

On dry roadways only.

Under all conditions.

Under all conditions, except for snow.

Front wheel braking is effective under all road conditions. It is unlikely that you will experience a front wheel skid, even on ice.

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2025 Kentucky | Frequently Asked Questions

To get a CDL Hazmat endorsement in Kentucky, you must first have a valid Commercial Driver's License (CDL). Then, pass the Hazardous Materials Endorsement Knowledge Test. After passing, you'll need to complete a federal security threat assessment application through the Transportation Security Administration (TSA), including fingerprinting and a background check. Once cleared, your Hazmat endorsement will be added to your CDL.

To obtain a CDL Hazmat license, you must first have a valid Commercial Driver's License (CDL). You must pass the Hazardous Materials Endorsement Knowledge Test. Additionally, you must complete a federal security threat assessment application through the Transportation Security Administration (TSA), which includes fingerprinting and a background check. You must also be at least 21 years old.

When applying for a CDL Hazmat endorsement, you'll need to provide proof of U.S. citizenship or lawful permanent residency (like a birth certificate or green card), a valid CDL, and proof of state residency. You will also need to complete the Hazardous Materials Endorsement application and pass the TSA's security threat assessment, which includes fingerprinting and a background check.

Yes, there is a dedicated written test for the CDL Hazmat endorsement. This test is known as the Hazardous Materials Endorsement Knowledge Test. It covers topics such as how to recognize hazardous materials, how to safely load and unload such materials, and what to do in case of an emergency situation.

The CDL Hazmat endorsement written test covers a range of topics related to hazardous materials. These include identifying different types of hazardous materials, understanding Hazmat placards and labels, packing and loading procedures, emergency response, and safety regulations. It also tests knowledge on transporting specific types of hazardous materials. Studying the Hazmat section in the CDL Manual is crucial for preparation.

Yes, there are extra charges associated with acquiring a CDL Hazmat endorsement in Kentucky. In addition to the standard CDL licensing fees, applicants must pay for a federal background check and fingerprinting. The exact amount may vary, so it's recommended to check the current fees with the Kentucky Transportation Cabinet or the agency administering the endorsement.

Yes, background checks and security clearances are mandatory for the CDL Hazmat endorsement. This is to ensure that drivers are responsible and trustworthy to handle hazardous materials. The Transportation Security Administration (TSA) conducts a federal background check, which includes checking criminal, immigration, and FBI records.

Yes, specialized training is required for the CDL Hazmat endorsement. You'll need to pass the Hazardous Materials Endorsement Knowledge Test. Additionally, certification involves a federal security threat assessment and fingerprinting for a background check. The process ensures drivers are equipped with the necessary knowledge and are safe to transport hazardous materials.

No, you cannot transport hazardous materials without a valid CDL Hazmat endorsement. In Kentucky, like in all other states, federal law mandates that drivers transporting hazardous materials must hold a CDL with a Hazmat endorsement. Driving without this endorsement can lead to serious penalties including fines and disqualification.

Yes, you can add the CDL Hazmat endorsement to your current CDL license. You don't need to apply for a new CDL. However, you must pass the Hazmat knowledge test, provide proof of U.S. citizenship or lawful permanent residency, and pass a TSA background check to add the endorsement.