Air Brakes Endorsement Test | Wisconsin 2025 #2

Train for FREE online with our Wisconsin 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 WI 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 you need to stop in an emergency, you should:

Lock the wheels and skid to a stop.

Stop in a way that keeps your vehicle in a straight line.

Stop in a way that turns your vehicle.

Expect your vehicle to slow down more quickly than usual.

If you need to make an emergency stop, you can use either the controlled braking method or the stab braking method. It's important to brake in a way that keeps your vehicle traveling in a straight line while still allowing you to turn, if necessary.

2 . In a dual air brake system:

Air tanks are shared between both systems.

Each system has its own air tanks.

You must designate which system you are using.

There are two air brake systems in a dual air brake system. The systems share a set of brake controls, but each system has its own tanks, hoses, and lines.

3 . If the low pressure warning light comes on while you are driving:

Braking will only occur if there is enough air in the tanks.

You can brake 14 times before the air in the system runs out.

You should continue to drive normally and check the brake system when it is convenient.

You should continue driving, but turn the emergency flashers on to warn other motorists.

If the low air pressure warning light turns on, you should stop and safely park your vehicle as soon as possible. Controlled braking will be possible only as long as enough air remains in the tanks.

4 . If the spring brakes are on, you should:

Not use the brake pedal.

Press the accelerator.

Move the steering wheel.

Be especially careful because the brakes may fail.

You should not apply the brake pedal if the spring brakes are activated. The brakes could be damaged if they are subjected to the force of air pressure and the springs at the same time.

5 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.

Set the control to the off position.

Set the control to the neutral position.

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.

6 . If your tractor is equipped with ABS but your trailer is not, the ABS:

Will not be effective.

Will still improve your steering control.

Will make jackknifing easier.

Will allow others to see when you brake.

In a tractor-trailer combination, if the tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the ABS will still improve the driver's steering control. The driver should keep an eye on the trailer and let up on the brakes if the trailer begins to swing out.

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2025 Wisconsin | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Wisconsin, you must have a valid Class A CDL. You'll need to pass the Doubles and Triples Endorsement knowledge test, which covers handling, coupling/uncoupling, inspecting doubles/triples, and more. After passing the test, the endorsement will be added to your CDL. Remember, driving experience with similar vehicles is recommended.

To obtain a CDL Doubles/Triples endorsement, you must already have a valid Class A Commercial Driver's License (CDL). You'll then need to pass the Doubles/Triples Endorsement knowledge test. The test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling. Once you pass the test, the endorsement is added to your CDL.

While Wisconsin does not explicitly require specialized experience or training for a CDL Doubles/Triples endorsement, it's highly recommended. The endorsement requires passing a knowledge test that covers handling, inspecting, and coupling/uncoupling doubles and triples. Having practical experience with similar vehicles can significantly help in understanding these areas and successfully passing the test.

Yes, an extra written knowledge test is mandatory to obtain the CDL Doubles/Triples endorsement in Wisconsin. The test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling. There is no additional skills or road test required specifically for this endorsement. Once you pass the written test, the endorsement is added to your CDL.

The CDL Doubles/Triples endorsement primarily requires a knowledge test, not a skills test. The knowledge test focuses on coupling and uncoupling, inspecting doubles and triples, and crucial safety rules. However, practical skills like maneuvering such vehicles safely, understanding the high rollover risk, and managing the longer stopping distances might be needed while operating the vehicle in real-world scenarios.

No, it is not permissible. In Wisconsin, like in all states, you must have a valid CDL Doubles/Triples endorsement to legally operate double or triple trailers. Operating such vehicles without the proper endorsement can lead to serious penalties, including fines and suspension of your commercial driving privileges. Always ensure you have the correct endorsements for the vehicle you're operating.

You can append the CDL Doubles/Triples endorsement to your existing CDL. You don't need to initiate a new license application. However, you must pass the required written knowledge test for the endorsement. Once you successfully pass the test, the Doubles/Triples endorsement will be added to your current CDL.

Yes, drivers holding a CDL Doubles/Triples endorsement in Wisconsin are subject to certain limitations and constraints. They are allowed to operate vehicles with double or triple trailers, but the total length of the combination cannot exceed 68 feet. Additionally, they must adhere to specific weight restrictions and follow all applicable traffic laws and regulations.

In Wisconsin, the maximum length for a double/trailer combination is 75 feet. For weight, the maximum gross vehicle weight is 80,000 pounds. However, the weight of each axle is also regulated, and cannot exceed 20,000 pounds for a single axle or 34,000 pounds for a tandem axle group. These restrictions ensure safe operation of large commercial vehicles on the road.

Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety regulations. These include not exceeding the maximum weight and length restrictions, ensuring secure coupling and uncoupling of trailers, and following safe driving practices like keeping a safe distance, checking mirrors frequently, and using proper braking techniques. Regular vehicle inspections are also required to ensure safety.