AIR BRAKES CDL PRACTICE TEST - DISTRICT OF COLUMBIA
16.
Emergency brakes and parking brakes must be held on by:
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hydraulic pressure.
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air pressure.
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mechanical force.
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All of the above.
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17.
Stepping on and off the brake pedal several times:
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may result in dangerously thin linings.
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reduces the air pressure in the tanks.
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may cause air leaks.
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All of the above.
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18.
When driving in very hot weather, the heat will increase the chances of:
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suspension system defects.
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ABS malfunction.
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loss of hydraulic pressure.
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tire failure.
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19.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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45
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12
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60
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20
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20.
When you make a quick lane change, the crack-the-whip effect can:
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turn the trailer over.
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improve your traction.
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the trailer to swing wide to the left.
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make it harder to turn without skidding.
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