SOUTH CAROLINA CDL AIR BRAKES PRACTICE TEST
21.
When coupling, you should:
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make sure the trailer wheels are not chocked.
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make sure the sliding fifth-wheel is locked.
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be aware that wrong coupling and uncoupling can be very dangerous.
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make sure the trailer kingpin is bent.
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22.
Having ABS on only the trailer:
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is very dangerous.
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makes the trailer more likely to swing out.
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makes the trailer more likely to roll over.
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still gives you more control over your vehicle during braking.
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23.
When you apply the brakes, the brake shoes and linings are pushed against:
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the S-cam.
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the supply pressure gauge.
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the safety relief valve.
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None of the above.
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24.
To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
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turn off the engine, release the parking brake
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release the parking brake, leave the engine running
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put alcohol into the air system, run the engine at a fast idle
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check the air compressor's drive belt, chock the wheels
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25.
The most common type of brake is the:
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S-cam drum brake
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R-cam drum brake
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G-cam disc brake
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B-cam disc brake
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