Air Brakes #2
Air Brakes Endorsement Test | Wisconsin 2025 #2 Page 3 of 4
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.
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13 . Which of the following is not a part of an air brake system?
An axle brake system
Air brakes consists of three separate braking systems: the service brake system, the parking brake system, and the emergency brake system.
14 . A tank endorsement is:
Optional when transporting hazardous materials.
In general, a tank endorsement is required to a drive tank vehicle used to transport liquids or gases. This applies to both hazardous and non-hazardous materials.
15 . Why do you need to drain air tanks regularly?
To remove bad air from the tanks
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
16 . If using air tanks with manually operated drains, how often should you drain the tanks?
Once every 3,000 miles
To prevent the build up of oil and water in a vehicle's air tanks, manually operated air tank drains should be used at the end of each day of driving.
17 . A low air pressure warning signal should activate:
When tank pressure falls below 5 psi.
In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.
18 . If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.
10 feet
The total stopping distance for vehicles equipped with air brakes is made up of four factors: perception distance, reaction distance, brake lag distance, and braking distance. When braking at a speed of 55 mph while driving on dry pavement, the brake lag can add around 32 feet to a vehicle's total stopping distance.
2025 Wisconsin | Frequently Asked Questions
A CDL Class A license in Wisconsin allows holders to operate any combination of vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 pounds or more, provided the vehicle(s) being towed are over 10,000 pounds. This includes tractor-trailers, truck and trailer combinations, and flatbeds. The license also requires specific endorsements for certain types of vehicles.
A Class A CDL license in Wisconsin allows the holder to operate vehicles such as tractor-trailers, truck and trailer combinations, tank vehicles, livestock carriers, and flatbeds. These are typically vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 lbs or more, where the vehicle being towed weighs more than 10,000 lbs.
To obtain a Class A CDL license in Wisconsin, applicants must be at least 18 years old (21 for interstate driving), possess a valid Wisconsin driver's license, pass a vision test, and successfully complete a general knowledge test. They must also pass skills tests, including a pre-trip vehicle inspection, basic vehicle control, and on-road driving. Medical examinations may also be required.
In Wisconsin, you must be at least 18 years old to qualify for a Class A Commercial Driver's License (CDL) for intrastate driving (within Wisconsin only). However, to drive a commercial vehicle across state lines (interstate driving), you must be at least 21 years old.
Endorsements are not required for a Class A CDL license, but they can provide additional driving privileges. These include T (Double/Triple Trailers), P (Passenger), N (Tank vehicles), H (Hazardous materials), and S (School Bus). Each endorsement requires passing specific knowledge tests, and some may require additional skills tests. It's important to get the endorsements that match your job requirements.
The Class A CDL skills test in Wisconsin encompasses three main areas: a pre-trip vehicle inspection to ensure the vehicle is safe to drive, a basic vehicle control test to demonstrate your ability to maneuver and control the vehicle, and an on-road driving test where you'll be tested on a variety of traffic situations and road conditions.
Yes, Class A CDL license holders in Wisconsin may face limitations depending on their specific circumstances. For instance, if the driver doesn't pass the air brake portion of the test, they get an "L" restriction and can't operate vehicles with air brakes. Additionally, drivers under 21 are restricted to intrastate operation. Also, certain medical conditions may impose restrictions.
Yes, in Wisconsin, the written Class A CDL test is available in English, Spanish, and Hmong. However, applicants should note that all CDL applicants must be able to read and understand 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, Wisconsin's Department of Transportation (WisDOT) is committed to providing accessible services. If you have a disability and require accommodations for the Class A CDL written test, you can make a request. Accommodations may include additional time, a separate testing room, or the use of special equipment. It's recommended to make the request as early as possible.
Yes, you can retake the Class A CDL written test in Wisconsin if you don't pass on your first attempt. However, you may have to wait one day before retaking the test. There might also be additional fees for each retest. It's recommended that you review the areas you struggled with before attempting the test again.