Air Brakes Endorsement Test | Louisiana 2025 #1

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.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . When leaving your vehicle unattended:

The parking brake must be always be used.

The parking brake should never be used.

Windows in the cab should be lowered.

Always apply the parking brake when leaving your vehicle unattended.

2 . If the safety relief valve in the air brake system releases air:

The compressor needs more air.

There is something wrong with the brakes.

You may continue driving.

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.

3 . 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.

4 . 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.

5 . What can happen if the air pressure gets too low in an air brake system?

The brakes may squeak.

The brakes may stop working.

The brakes may be sluggish.

Pressing and releasing the brake pedal unnecessarily can let air out of the braking system faster than the compressor can replace it. Air brakes may cease to work effectively if the pressure becomes too low.

6 . The air storage tanks:

Hold only enough air for one braking cycle.

Hold enough air for the brakes to be used several times if the compressor stops working.

Do not hold air unless there is an emergency.

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.

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2025 Louisiana | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Louisiana, you must first have a valid CDL. Then, study the Doubles and Triples section of the Louisiana CDL manual to prepare for the written knowledge test. Visit a DMV office to take and pass this test. There's no skills test required for this endorsement, only the written knowledge test.

To obtain a CDL Doubles/Triples license, you must already have a valid Commercial Driver's License (CDL). You'll need to study the Doubles and Triples section of your state's CDL manual, then pass a written knowledge test at your local DMV. No additional skills test is required for this endorsement, only the written examination.

No specialized experience or training is legally required for a CDL Doubles/Triples endorsement. However, you must have a valid Commercial Driver's License (CDL). You will need to study the Doubles and Triples section of your state's CDL manual and pass a written knowledge test. Practical training, though not mandatory, could be beneficial for handling these larger vehicles.

Yes, an additional written knowledge test is mandatory for the CDL Doubles/Triples endorsement. You'll need to study the Doubles and Triples section of your state's CDL manual. The written test covers topics like coupling and uncoupling, inspecting doubles and triples, and pulling double/triple trailers. No additional skills test is required for this endorsement.

The CDL Doubles/Triples endorsement does not require a specific skills or maneuvers test. However, the written knowledge test includes topics such as coupling and uncoupling, inspecting doubles and triples, and pulling double/triple trailers. It's important to thoroughly understand these concepts. Practical skills may be beneficial, but they are not formally assessed for this endorsement.

No, it is not permissible to operate double/triple trailers without a valid CDL Doubles/Triples endorsement in Louisiana. This endorsement is required by law to ensure the driver has the necessary skills and knowledge to safely operate such vehicles. Failure to obtain the proper endorsement can result in legal penalties, including fines and suspension of your CDL.

You can add the CDL Doubles/Triples endorsement to your existing Commercial Driver's License. You don't need to initiate a new application for a separate license. However, you must pass the Doubles/Triples endorsement knowledge test. Once you pass, the endorsement will be added to your current CDL.

Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. These include restrictions on the overall length of the vehicles, the weight of the trailers, and where these vehicles can be driven. Additionally, drivers must comply with hours-of-service regulations to prevent fatigue. Violation of these limitations can result in legal penalties and endanger public safety.

In Louisiana, the maximum legal weight for a vehicle is 80,000 pounds. The maximum length for a double trailer is 81 feet 6 inches, while triple trailers are not allowed. However, these restrictions can be subject to change depending on the specific roadway and bridge limits. Always check local regulations before driving.

Yes, there are specific safety guidelines. Drivers must ensure proper coupling and uncoupling of trailers, and make sure the weight is evenly distributed. They must also maintain safe following distances, use extra caution in adverse weather conditions, and be aware of the high rollover risk due to the higher center of gravity. Regular vehicle inspections are also required.