AIR BRAKES CDL PRACTICE TEST - PENNSYLVANIA
16.
How many reflective triangles/emergency reflectors should you carry?
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4
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3
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1
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2
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17.
What factors can cause brakes to fade?
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Dirt roads and in unpaved yards.
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Excessive heat and brakes out of adjustment.
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Slippery surfaces and shaded areas.
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Gravel and tar.
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18.
Which of the following is a reason why air tanks must be drained?
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Your transmission fluid may drain out.
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Your battery fluid may drain out.
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Your brakes may fail due to the water freezing.
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The governor may stop the compressor from pumping air.
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19.
Before driving a vehicle with a dual air system, the air compressor should build up a minimum of _____ pressure in both the primary and secondary systems.
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50 psi
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100 psi
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10 psi
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75 psi
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20.
In some vehicles a modulating control valve may be used to:
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apply the front brakes.
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apply the spring brakes gradually.
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decrease the pressure in the brake system.
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apply the parking brake.
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