ME CDL AIR BRAKES PRACTICE TEST
16.
Air storage tanks:
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pump air into the air storage tanks.
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use parts of the service brake systems to stop the vehicle in a brake system failure.
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hold compressed air for the brakes.
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17.
In some vehicles a modulating control valve may be used to:
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apply the spring brakes gradually.
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apply the front brakes.
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decrease the pressure in the brake system.
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18.
Which of the following is NOT part of the drum brake?
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Brake drum
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Safety valve
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Axle
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19.
The __________ keeps air from going out if the air compressor develops a leak.
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one-way check valve
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tractor protection valve
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emergency relay valve
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20.
Spring brakes:
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are not designed to work in an emergency when your service brakes fail.
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apply when air pressure leaves the brake chamber and release when air pressure builds up in the chamber.
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are air applied like service brakes.
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