Air Brakes #2
Air Brakes Endorsement Test | Alabama 2025 #2 Page 2 of 4
Train for FREE online with our Alabama 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 AL 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 . What should happen before the air pressure in an air brake system tank falls below 55 psi?
The low air pressure warning signal must activate before the air supply pressure drops below 55 psi in the air tank. If the warning signal does not turn on when being tested during an inspection, the vehicle is not safe to drive.
8 . If the low air pressure warning signal comes on, you should:
If the low air pressure warning signal comes on while you are driving a vehicle with air brakes, you should immediately bring the vehicle to a safe stop while you are still able to control the brakes. Inspect and repair the brakes as soon as possible.
9 . All air tanks must include:
A warning sticker.
Air brake system tanks must contain drain valves. These valves are used to drain accumulated oil and water from the tanks and may be either manually or automatically operated.
10 . During a static leakage test, the maximum leakage rate for a double combination vehicle is:
4 psi in one minute.
When performing a static leakage test on a double combination vehicle with air brakes, the leakage rate should be no more than 3 psi in one minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.
11 . What is a wig wag?
A part within the braking unit that allows air to move freely
A wig wag is a type of low air pressure warning device in an air brake system. It drops a mechanical arm into the driver's view when the air pressure in the tanks falls below 60 psi.
12 . What can happen if the air pressure gets too low in an air brake system?
The brakes will be very sensitive.
Pressing and releasing the brake pedal unnecessarily can let air out faster than the compressor can replace it, reducing the available air pressure. If the air pressure in an air brake system gets too low, the brakes will no longer work.
See the exact questions that will be on the 2025 Alabama DMV exam.
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2025 Alabama | Frequently Asked Questions
A CDL Class B license in Alabama allows the driver to operate single vehicles with a gross vehicle weight rating (GVWR) of 26,001 or more pounds, or any such vehicle towing a vehicle not in excess of 10,000 pounds GVWR. This includes straight trucks, buses, large passenger vehicles, segmented buses, and trucks towing smaller vehicles.
In Alabama, a Class B CDL license permits the operation of single vehicles with a gross vehicle weight rating (GVWR) of 26,001 or more pounds, or towing a vehicle not exceeding 10,000 pounds GVWR. This includes large buses, segmented buses, straight trucks, and trucks towing smaller vehicles such as a small trailer or boat.
To acquire a Class B CDL license in Alabama, applicants must be at least 21 years old (or 18 for intrastate travel), possess a valid Alabama driver's license, pass a vision test, and complete a written knowledge test. They must also complete a skills test in a vehicle representative of the class of CDL they are applying for.
In Alabama, you must be at least 21 years old to qualify for a Class B CDL license for interstate commerce. However, if you only intend to drive within the state (intrastate commerce), you can qualify for a Class B CDL license at 18 years old.
Specific endorsements aren't necessary for a Class B CDL license, but they can provide additional driving privileges. For instance, endorsements for passenger vehicles, school buses, tank vehicles, or hazardous materials can be added to a Class B CDL after passing specific written and skills tests. These endorsements broaden the range of vehicles you can operate.
The Class B CDL skills assessment in Alabama includes three parts: the vehicle inspection test, the basic controls test, and the road test. The vehicle inspection test assesses your ability to determine if your vehicle is safe to drive. The basic controls test evaluates your ability to maneuver and control the vehicle. Lastly, the road test assesses your on-road driving skills.
Yes, Class B CDL license holders in Alabama are limited to operating single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or a vehicle towing another vehicle not exceeding 10,000 pounds GVWR. They cannot operate a combination of vehicles (like tractor-trailers) that would require a Class A CDL. Specific endorsements may also be required for certain types of vehicles or loads.
In Alabama, the written Class B CDL test is primarily offered in English. However, some locations may offer the test in Spanish. It's important to note that federal regulations require all commercial drivers to read and speak English sufficiently to communicate with the general public, understand highway traffic signs and signals, and respond to official inquiries.
Yes, you can request test accommodations for the Class B CDL written exam in Alabama if you have a disability. You'll need to provide documentation of your disability and specify the type of accommodation needed. The Alabama Law Enforcement Agency will review your request and determine if the accommodation can be provided without compromising the integrity of the test.
Yes, if you don't pass the Class B CDL written test in Alabama, you can retake it. However, you must wait at least one day before retaking the test. If you fail the test three times, you will need to start the application process over, including paying the necessary fees. It's recommended to study thoroughly to increase your chances of passing on your next attempt.
