Air Brakes #2
Air Brakes Endorsement Test | South Carolina 2024 #2 Page 3 of 4
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.
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13 . What can happen if the air pressure gets too low in an air brake system?
The brakes will be very sensitive.
Pressing and releasing the brake pedal unnecessarily can let air out faster than the compressor can replace it, reducing the available air pressure. If the air pressure in an air brake system gets too low, the brakes will no longer work.
14 . At what psi is the safety valve set to open?
500 psi
In an air brake system, the first tank that receives compressed air has a safety valve that releases air if the pressure gets too high. It is usually set to open at 150 psi. If the valve must open, there is a fault in the system that should be repaired by a mechanic.
15 . An alcohol evaporator in an air brake system:
Some air brake systems include an evaporator that introduces alcohol into the system. The alcohol can help prevent ice from forming within the system.
16 . 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.
17 . An air brake-equipped vehicle traveling at a speed of 55 mph under ideal driving conditions will need approximately ____ to come to a complete stop.
450 feet
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.
18 . What color light indicates a vehicle's ABS is not working?
On vehicles with Anti-Lock Braking Systems (ABS), yellow malfunction lamps alert the driver to ABS malfunction.
See the exact questions that will be on the 2024 South Carolina DMV exam.
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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.
