CDL Air Brakes Practice Test - Missouri
21.
In vehicles with air brakes, the air compressor governor:
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air storage tanks will pump air into the air compressor.
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controls when the air compressor will pump air into the air storage tanks.
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22.
Passive railroad crossings:
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should never be crossed using a CMV.
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have at least one traffic control device.
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do not have traffic control devices.
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23.
Do NOT use the parking brakes:
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when you leave your vehicle.
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if the brakes are very hot.
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when you park for less than two hours.
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24.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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You may not notice a major leak in the service line until you try to put the brakes on.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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25.
Older trailers do not have spring brakes. If the air supply leaks away:
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the trailer will stop normally.
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there will be no emergency brakes.
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the ABS won't work properly.
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