CDL Air Brakes Practice Test - Vermont
16.
The safety relief valve is usually set to open at ____ psi.
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50
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150
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75
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17.
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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make it harder to turn without skidding.
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18.
A broken exhaust system:
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can improve fuel efficiency.
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poses no threat to the driver.
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can let poisonous carbon monoxide to leak into the cab.
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19.
The low pressure warning signal will generally activate when the air pressure falls between:
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55–75 psi.
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80–85 psi.
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85–100 psi.
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20.
If the air tanks are not drained:
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the water can freeze in cold
weather and cause brake failure.
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the air pressure in the tanks is reduced.
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your speed must be reduced to 5 MPH below your “safe” speed.
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