AIR BRAKES PRACTICE TEST - MARYLAND
16.
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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20
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12
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60
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45
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17.
_________ must have a low air pressure warning signal.
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Vehicles with air brakes built after 2010
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All vehicles with air brakes
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Vehicles with air brakes built after 2005
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Only vehicles with air brakes built before 2015
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18.
Brakes out of adjustment can cause the other brakes to:
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apply more braking power.
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last longer.
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work better.
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overheat and fade.
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19.
The air compressor governor:
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stops the compressor from pumping air.
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allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
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controls when the air storage tanks will pump air into the air compressor.
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All of the above.
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20.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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55 to 74 psi.
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20 to 45 psi.
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5 to 15 psi.
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30 to 35 psi.
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