Air Brakes #2
Air Brakes Endorsement Test | Louisiana 2025 #2 Page 2 of 4
Train for FREE online with our Louisiana 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 LA 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 . The air storage tanks:
The air storage tanks in an air brake system store compressed air to be used for braking. They hold enough air for the brakes to still be used several times if the compressor stops working.
8 . What do the two systems of a dual air brake system share?
Both systems in a dual air brake systems share a single air compressor. If the air compressor is damaged, neither system will be able to operate properly.
9 . 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.
10 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Some older vehicles have front brake limiting valves with "normal" and "slippery" settings. Setting a brake limiting valve to "slippery" reduces the vehicle's stopping power, so a driver should make sure the valve is in its "normal" position. Front wheel braking has proven to be effective in all driving conditions.
11 . An alcohol evaporator is especially important:
Some air brake systems contain an alcohol evaporator. This evaporator introduces alcohol into the system to help prevent ice from forming in cold weather.
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 Louisiana | Frequently Asked Questions
A CDL Class B license in Louisiana allows drivers 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 includes buses, farm labor vehicles, and any combination of vehicles not defined under Class A.
A Class B CDL license in Louisiana allows the operation of single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or a vehicle towing another not exceeding 10,000 pounds. This includes straight trucks, large buses, segmented buses, box trucks, and dump trucks with small trailers.
To acquire a Class B CDL license in Louisiana, you must be at least 18 years old (21 for interstate driving), possess a valid Louisiana driver's license, pass a vision exam, and complete a written knowledge test. You will also need to pass a skills test, which includes a pre-trip vehicle inspection, a basic controls test, and an on-road driving exam.
In Louisiana, to qualify for a Class B Commercial Driver's License (CDL), you must be at least 18 years old for intrastate driving (within Louisiana only) and at least 21 years old for interstate driving (across state lines or transporting hazardous materials). Other prerequisites include passing a knowledge test and a skills test.
Specific endorsements are not necessary for a Class B CDL license in Louisiana but can broaden your employment opportunities. Endorsements certify additional skills like driving a school bus, tank vehicle, or vehicles carrying hazardous materials. To obtain an endorsement, you must pass specific knowledge tests and, in some cases, a skills test.
The Class B CDL skills assessment in Louisiana encompasses three parts: the pre-trip vehicle inspection, the basic vehicle control test, and the on-road driving test. You'll need to demonstrate knowledge of your vehicle, show that you can control it in a variety of situations, and safely operate it in traffic conditions.
Yes, Class B CDL license holders in Louisiana are limited to operating single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or towing a vehicle not exceeding 10,000 pounds GVWR. They cannot operate Class A vehicles unless they upgrade their license. Furthermore, they must adhere to all federal and state motor carrier safety regulations.
In Louisiana, the written Class B CDL test is typically administered in English. However, some test centers may offer the test in Spanish. It's important to note that even if you take the written test in Spanish, you must still be able to read and speak English well enough to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, you can request test accommodations for the Class B CDL written exam in Louisiana due to disability. The state follows the guidelines of the Americans with Disabilities Act (ADA) and provides reasonable accommodations to individuals who can provide documentation of their disability. It's important to make your request well in advance of your test date.
If you don't pass the Class B CDL written test in Louisiana, you can retake it. However, there's a waiting period before you can retake the test. The waiting period varies but is typically one day. You'll also need to pay a re-examination fee each time you retake the test. It's advisable to study thoroughly before reattempting.
