MAINE CDL AIR BRAKES PRACTICE TEST
16.
Before driving a truck or bus with a dual air brake system, the minimum pressure in both the primary and secondary
systems should be at least:
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75 psi.
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100 psi.
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130 psi.
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17.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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greater; less
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less; more
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greater; more
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18.
The air compressor governor controls:
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the air pressure applied to the brakes.
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when air tank pressure falls below the “cut-out” level.
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when the air compressor will pump air into the air storage tanks.
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19.
The space under a heavily loaded vehicle can be very small. This can cause problems:
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on dirt roads.
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when crossing railroad tracks.
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All of the above.
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20.
The use of air brakes on a steep downgrade is only a supplement to:
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the braking effect of the engine.
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the use of the parking brakes.
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the use of the spring brakes.
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