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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the South Dakota CDL knowledge test. The SD CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the South Dakota CDL Manual. Take this SD CDL practice test now to prepare for the actual air brakes test!
1. To brake in a way that will keep your vehicle in a straight line and allow you to turn if it becomes necessary, you can use:
the "controlled braking" method or the "stab braking" method.
the "controlled braking" method.
the "stab braking" method.
None of the above.
2. If your trucks has a high center of gravity, which of the following is true for curves?
You should slow down, as your truck can roll over at the posted speed limit for the curve.
Reduce your speed to a crawl.
You should travel at the posted speed limit.
None of the above.
3. When the spring brakes are on, you should:
exceed the posted speed limit.
press the accelerator.
pump the brakes.
not push the brake pedal down.
4. Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
reduces the risk of ice in air brake valvesĀ during cold weather.
helps you avoid wheel lock up.
reduces the risk of having an accident due to drowsy driving.
helps keep the engine cool, as well as lubricating it.
5. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
6. If your tires are hot, you should NOT:
let air out of the tires so the pressure goes back to normal.
drive until you correct the cause of the overheating.
once the tires have cooled down, make another stop to check the tires.
stop to let the tires cool down.
7. When backing a trailer, you should:
turn the steering wheel in the direction you want to go.
avoid correcting the drift.
never make pull-ups to reposition your vehicle.
try to position your vehicle so you can back in a straight line.
8. The stop light switch:
warns you when the air supply pressure drops below 55 psi.
tells you when you need to use your parking brake instead of the service brake.
should be used to fend off tailgaters.
turns on the brake lights when you put on the air brakes.
9. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:
reduce the chance of the front wheels skidding.
prevent movement of cargo.
keep from rolling back.
hold compressed air.
10. Brake lag is:
the time required for the air brakes to work after the brake pedal is pushed.
the distance your vehicle will travel, in ideal conditions, while you are braking.
the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
the amount of air pressure required to stop the vehicle.
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SD Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
Number of questions: 25
Correct answers to pass:20
Passing score:80%
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