Air Brakes #1
Air Brakes Endorsement Test | Wisconsin 2025 #1 Page 2 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.
25
20
20
7 . The ____ tells a driver how much pressure is in the air tanks.
Drum brake
A vehicle that is equipped with air brakes must also be equipped with a supply pressure gauge. This gauge tells the driver how much air pressure is in each of the vehicle's air tanks.
8 . 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.
9 . Air pressure should build up in a single air system within:
In single air systems, air pressure should build from approximately 50 to 90 psi within three minutes.
10 . If your tractor is equipped with ABS but your trailer is not, the ABS:
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.
11 . How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?
A vehicle's total stopping distance is made up of perception distance, reaction distance, brake lag distance, and braking distance. With all of these factors included, an air brake-equipped vehicle traveling at a speed of 55 mph under ideal driving conditions will need approximately 450 feet to come to a complete stop.
12 . What should happen before the air pressure in an air brake system tank falls below 55 psi?
The low air pressure warning signal must activate before the air supply pressure drops below 55 psi in the air tank. If the warning signal does not turn on when being tested during an inspection, the vehicle is not safe to drive.
See the exact questions that will be on the 2025 Wisconsin DMV exam.
99.2% of people who use the cheat sheet pass the FIRST TIME
Lillian MCcranie explains how our CDL study guide was helpful in passing the exam and recommends it to everyone.
Cameron tells us how he purchased the CDL exam, and found it to be a useful tool which helped him pass the exam and find a job.
2025 Wisconsin | Frequently Asked Questions
A CDL Class B license in Wisconsin allows the holder 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 typically includes buses, dump trucks, delivery trucks, and other similar vehicles. It does not cover operation of Class A vehicles.
A Class B CDL (Commercial Driver's License) in Wisconsin allows you 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 typically includes buses, dump trucks, tow trucks, delivery trucks, and straight trucks.
To acquire a Class B CDL license in Wisconsin, you 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 knowledge test. You'll also need to pass a skills test in the type of vehicle you plan to drive. Medical clearance may also be required.
In Wisconsin, you must be at least 18 years old to qualify for a Class B CDL license. However, to drive a commercial vehicle across state lines (interstate driving) or to transport hazardous materials, you must be at least 21 years old.
Yes, specific endorsements may be necessary for a Class B CDL license depending on the type of vehicle you plan to drive or the cargo you will carry. These can include passenger, school bus, tanker, or hazardous materials endorsements. Each endorsement requires passing additional knowledge and/or skills tests.
The Class B CDL skills assessment in Wisconsin includes three parts: the pre-trip vehicle inspection, basic vehicle control, and on-road driving. You will be tested on your ability to inspect your vehicle, control the vehicle at low and high speeds, and navigate through traffic and intersections safely.
Yes, Class B CDL license holders in Wisconsin are restricted to operating vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 26,000 pounds, or towing vehicles not more than 10,000 pounds. They cannot operate Class A vehicles unless they have the appropriate endorsements. They are also subject to federal driving regulations.
Yes, in Wisconsin, the written Class B CDL test is available in English and Spanish. However, the Federal Motor Carrier Safety Administration requires that all CDL holders understand and read 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 accommodations for the Class B CDL written exam in Wisconsin if you have a disability. The Wisconsin Department of Transportation provides reasonable testing accommodations under the Americans with Disabilities Act. You'll need to provide documentation of your disability and specify the type of accommodation you need when scheduling your exam.
Yes, you can retake the Class B CDL written test in Wisconsin if you fail on your first attempt. You're allowed to retake the test the next day. However, if you fail three times, you will need to wait until your eligibility is renewed, which is typically a period of 6 months, before you can try again.
