Air Brakes #1
Air Brakes Endorsement Test | South Dakota 2025 #1 Page 4 of 4
Train for FREE online with our South Dakota 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 SD 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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19 . The air compressor governor controls:
The speed of the vehicle.
In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.
20 . Both systems in a dual air brake systems share:
An air compressor.
Both systems in a dual air brake system share a single air compressor. If the air compressor is damaged, neither system will be able to operate properly.
21 . The parking brake should be:
Used to stop the vehicle in normal driving.
The parking brake should be applied every time you park your vehicle.
22 . What kind of force must emergency brakes use?
Electrical
Because air pressure can eventually leak away, the emergency brakes in an air brake system must be held on by mechanical force.
23 . Vehicles with dual air brake systems:
Do not need time to build air pressure before a trip.
Before driving a vehicle with a dual air brake system, you must allow the air compressor time to build up at least 100 psi of air pressure in both the primary and secondary systems.
24 . Air tank drains:
Must remain open while driving.
In an air brake system, the air storage tanks are equipped with drains to allow water and compressor oil to be removed. The water and oil can damage the brakes if left to accumulate in the system.
25 . An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:
80 psi.
An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level of 125 psi. This air pressure level is referred to as the "cut-out" level.
2025 South Dakota | Frequently Asked Questions
In South Dakota, a Commercial Driver's License (CDL) Class B is required to operate single vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or any such vehicle towing another not in excess of 10,000 pounds. This includes buses, farm labor vehicles, and any vehicle designed to transport 16 or more passengers.
A Class B CDL in South Dakota permits you to operate single vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or tow a vehicle not exceeding 10,000 pounds. This includes large buses, segmented buses, dump trucks with small trailers, straight trucks and delivery trucks.
To acquire a Class B CDL license in South Dakota, you must be at least 18 years old (21 if you plan to drive across state lines), have a valid South Dakota driver's license, pass a vision test, and successfully complete both the written and skills tests for the Class B CDL. You must also provide proof of your identity, social security number and South Dakota residency.
In South Dakota, you must be at least 18 years old to qualify for a Class B Commercial Driver's License (CDL). However, if you plan to drive commercial vehicles across state lines or transport hazardous materials, you must be at least 21 years old. This age requirement is consistent with federal law.
Yes, specific endorsements may be necessary depending on the type of vehicle you plan to drive or cargo you plan to carry with a Class B CDL. For example, you may need a Passenger endorsement for buses, a School Bus endorsement for school buses, or a Hazardous Materials endorsement for transporting hazardous materials. Each endorsement requires additional testing.
The Class B CDL skills assessment in South Dakota includes three parts: pre-trip inspection, basic control skills, and on-road driving. The pre-trip inspection tests your ability to assess vehicle safety. Basic control skills focus on maneuvers like backing up. Lastly, the on-road test assesses your ability to safely operate the vehicle in various traffic situations and road conditions.
Yes, there are limitations for Class B CDL license holders. They are licensed to operate vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or a vehicle towing another vehicle not exceeding 10,000 pounds. They cannot operate Class A vehicles unless they have the appropriate endorsement. Also, interstate driving is restricted to drivers aged 21 and above.
In South Dakota, the written Class B CDL test is primarily administered in English. However, some locations may offer it in Spanish. It's important to check with the local DMV office in advance. Keep in mind that English proficiency is required to obtain a CDL, as federal regulations mandate understanding of English to drive commercial vehicles.
Yes, you can request accommodations for the Class B CDL written exam in South Dakota if you have a disability. You'll need to provide documentation of your disability and specify the type of accommodation you're requesting. South Dakota is committed to providing equal access to testing opportunities for all individuals. It's advised to make your request well in advance of your scheduled test date.
Yes, if you fail the Class B CDL written test in South Dakota, you are allowed to retake it. However, you must wait one day before retaking the test. If you fail three times, you will have to wait 60 days before attempting again. It's advisable to study thoroughly and use practice tests to prepare for your next attempt.