SOUTH CAROLINA CDL AIR BRAKES PRACTICE TEST
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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 Carolina CDL knowledge test. The SC 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 Carolina CDL Manual. Take this SC CDL practice test now to prepare for the actual air brakes test!
1.
Parking brakes are:
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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not required on trailers.
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2.
You are going down a steep grade. Once the vehicle is in the proper low gear, you should brake just hard enough to feel a slowdown, and then release the brakes when your speed has been reduced to ____ below your safe speed.
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5 mph
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20 mph
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10 mph
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15 mph
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3.
If your truck has automatic transmission, you should downshift:
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after entering a curve.
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whenever road conditions allow.
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when you need to accelerate.
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when going down grades.
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4.
Air brakes use ________ to make the brakes work.
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compressed oil
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compressed air
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compressed gases
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compressed gas cylinders
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5.
The s-cam:
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helps ensure that air flows to all trailers.
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forces the brake shoes away from one another and presses them against the inside of the brake drum.
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pulls the brake shoes away from the drum.
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All of the above.
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