Air Brakes Endorsement Test | South Carolina 2024 #2

Train for FREE online with our South Carolina 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 SC Class A/Class B driver license in 2024, 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 a brake pedal is pressed and the S-cam is turned, the S-cam:

Presses the brake shoes against the inside of the brake drum.

Tightens the brake drum onto the axle.

Presses the brake lining against the wheel.

Releases air from the air tanks.

When a brake pedal is pressed and the S-cam is turned, the S-cam presses the brake shoes against the inside of the brake drum. This causes friction and will cause the vehicle to slow.

2 . What does ABS do?

Prevent wheel lockup

Prevent the air compressor from overheating

Prevent the front brakes from being used on ice

Prevent the brakes from being used if downshifting would be more effective

The purpose of an Anti-Lock Braking System (ABS) is to prevent wheels from locking up during hard applications of the brakes, especially on slippery surfaces.

3 . What do the two systems of a dual air brake system share?

Hoses

An air compressor

Air tanks

Both systems in a dual air brake systems share a single air compressor. If the air compressor is damaged, neither system will be able to operate properly.

4 . Emergency brakes are:

Not required on trucks.

Only required on trailers.

Required on tractors.

Only required when transporting hazardous materials.

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.

5 . To use the stab braking method, you should:

Apply the brakes completely until the wheels lock up, release the brakes until the wheels start rolling, then repeat the process.

Apply the brakes about halfway, but allow the wheels to keep rolling.

Apply the brakes completely until the wheels lock up and the vehicle stops.

Apply the emergency brake until the vehicle starts to slow.

The stab braking method for emergency stops involves fully applying the brakes until they lock up. The brakes are then released until the wheels start rolling, and then the process is repeated.

6 . Water and compressor oil are usually found in the compressed air within an air brake system. Water and compressor oil:

Are necessary for the proper function of the air brake system.

Should be added if low.

Should be removed regularly.

Are not concerns.

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. Manually operated air tank drains must be opened daily to remove this build-up.

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2024 South Carolina | Frequently Asked Questions

In South Carolina, a Commercial Driver's License (CDL) Class B 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 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 Commercial Driver's License (CDL) in South Carolina 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 a vehicle not in excess of 10,000 pounds GVWR. This includes buses, farm tractors, dump trucks, delivery trucks, and utility trucks.

To acquire a Class B CDL in South Carolina, you must be at least 18 years old (21 for interstate driving), possess a valid South Carolina driver's license, pass a vision test, and complete a Commercial Driver's License (CDL) application. Additionally, you must pass the written knowledge exam and the skills test, which includes a pre-trip vehicle inspection, a basic controls test, and a road test.

In South Carolina, you must be at least 18 years old to qualify for a Class B Commercial Driver's License (CDL) for intrastate driving (within South Carolina only). However, you must be at least 21 years old to drive a commercial vehicle across state lines, carry hazardous materials, or transport passengers.

While not always necessary, specific endorsements can be added to a Class B CDL license in South Carolina to provide additional driving privileges. These include endorsements for passenger vehicles (P), school buses (S), and tank vehicles (N). Each endorsement requires passing a knowledge test, and some also require a skills test.

The Class B CDL skills assessment in South Carolina involves a pre-trip vehicle inspection, a basic controls test, and a road test. The pre-trip inspection tests your ability to evaluate your vehicle's safety. The basic controls test assesses your ability to maneuver and control the vehicle. The road test evaluates your on-road driving skills, including turning, merging, and navigating intersections.

Yes, Class B CDL license holders in South Carolina are limited to driving single vehicles with a gross vehicle weight rating (GVWR) of 26,001 or more pounds, or any such vehicle towing a vehicle not exceeding 10,000 pounds GVWR. They cannot drive a Class A vehicle without the proper endorsement. Also, transporting passengers or hazardous materials may require additional endorsements.

In South Carolina, the written Class B CDL test is primarily administered in English. However, some locations may offer the test in Spanish. It's important to confirm language availability with your local DMV. Remember, even if you take the written test in another language, you must still understand English to pass the road skills test.

Yes, you can request accommodations for the Class B CDL written exam in South Carolina if you have a disability. You will need to provide documentation of your disability and specify the type of accommodation needed. Contact your local DMV office in advance to make these arrangements and to ensure they can provide the necessary accommodations.

Yes, if you don't pass the Class B CDL written test in South Carolina, you can retake it. However, you must wait at least one day before retesting. Keep in mind that each attempt may incur additional testing fees. It's recommended to study thoroughly using the South Carolina Commercial Driver License Manual before reattempting the test.