Air Brakes Endorsement Test | Montana 2025 #1

Train for FREE online with our Montana 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 MT 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 . Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.

Squishy brakes.

Too much air collecting in the tanks.

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.

2 . Brakes may get out of adjustment:

If they are too hot.

In colder weather.

If they are used.

If they get wet.

Brakes can get out of adjustment quickly, especially if they are used to the point of overheating. Brake adjustment should be checked frequently.

3 . Using the brakes creates heat. If too much heat is produced:

The brakes may not work.

The brakes may squeak more than usual.

The brakes will brake unevenly.

Brakes are designed to take a lot of heat, but drivers should not rely solely on the brakes to slow their vehicle. Brakes may fade and lose their ability to slow down the vehicle if they become too hot, so drivers should also rely on the engine braking effect.

4 . What do anti-lock brakes do?

Help a driver avoid wheel lockup

Lock up the front wheels

Prevent a vehicle from accelerating while traveling uphill

Prevent a vehicle from accelerating while traveling downhill

The function of an Anti-Lock Braking System (ABS) is to prevent the vehicle's wheels from locking up from hard brake application.

5 . Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

Stop the compressor from pumping air.

Release air from the tanks.

Begin pumping air into the tanks.

An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level around 125 psi. This air pressure level is referred to as the "cut-out" level.

6 . Front brake limiting valves were intended to:

Prevent the front tires from skidding.

Prevent the front tires from overheating.

Create equal brake usage.

Remove uncertainty when applying the brakes.

Some older vehicles with air brakes have front brake limiting valves. These valves were intended to reduce the risk of front wheels skidding. However, research has shown that such devices are unnecessary, so they should be left in the "normal" position.

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2025 Montana | Frequently Asked Questions

In Montana, to secure a CDL Doubles/Triples endorsement, you must first hold a valid Commercial Driver's License (CDL). Then, you need to pass the Doubles/Triples Knowledge written test. After passing the test, pay the necessary fees at your local Montana Motor Vehicle Division office to have the endorsement added to your CDL.

To obtain a CDL Doubles/Triples endorsement, you must hold a valid Commercial Driver's License (CDL). You will then need to pass the Doubles/Triples Knowledge written test. Some states may require additional training or experience. Check with your local Department of Motor Vehicles for specific requirements in your state.

While you must have a valid Commercial Driver's License (CDL) to get a Doubles/Triples endorsement, Montana doesn't explicitly require specialized training or experience. However, it's recommended to undergo training for safety and proficiency. Keep in mind, you must pass the Doubles/Triples Knowledge Test to get the endorsement.

Yes, in Montana, to obtain a CDL Doubles/Triples endorsement, you are required to pass a specialized knowledge test. This test is designed to assess your understanding of safety protocols, operational procedures, and regulations associated with driving double and triple trailers. It's separate from the general CDL written exam.

The CDL Doubles/Triples endorsement test in Montana is a written knowledge test, not a skills test. It focuses on specific rules and safety guidelines related to hauling double and triple trailers. Topics include coupling and uncoupling, inspecting doubles and triples, and handling these large vehicles on the road. Practical skills or maneuvers are not directly tested for this endorsement.

No, it is not permissible. In Montana, as in all U.S. states, you must have a valid CDL with a Doubles/Triples endorsement to legally operate double or triple trailers. Driving such vehicles without the appropriate license and endorsement can result in hefty fines, license suspension, and potential legal consequences.

Yes, you can add the Doubles/Triples endorsement to your current CDL. You don't need to initiate a new license application. However, you will need to pass the Doubles/Triples endorsement knowledge test, and pay an additional fee. Once you pass, the endorsement will be added to your existing CDL.

Yes, there are limitations. A CDL Doubles/Triples endorsement allows you to operate vehicles with more than one trailer, but it doesn't permit you to drive all types of commercial vehicles. For instance, you would need additional endorsements to drive a school bus or a vehicle carrying hazardous materials. Furthermore, all CDL rules regarding medical fitness, hours of service, etc., still apply.

In Montana, the maximum weight for a vehicle (or combination) with a load is 131,060 pounds. The maximum length for a single trailer is 53 feet, and for double/triple trailers, the combined length should not exceed 75 feet. However, these limits can be subject to exceptions based on specific routes or permit conditions. Always check local regulations.

Yes, there are specific safety guidelines. Drivers must ensure the coupling devices are secure, maintain a safe following distance, and avoid sudden lane changes or hard braking. Also, they must be aware of the "crack-the-whip" effect, which can cause the last trailer to overturn at high speeds or sharp turns. Regular vehicle inspections and adhering to federal and state regulations are also required.