IL CDL AIR BRAKES PRACTICE TEST
21.
The alcohol evaporator:
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ensures the coolant temperature gauge remains in the normal range.
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shows how much air pressure you are applying to the brakes.
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helps to reduce the risk of ice in air brake valves and other parts in cold weather.
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eliminates the need for daily air tank drainage.
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22.
Before driving a vehicle with a dual brake brake system, the driver should:
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wait at least 5 minutes before driving.
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pump the brake pedal 10 times to build pressure.
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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wait at least 10 minutes before driving.
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23.
In a dual air brake system, if one air system is very low on pressure:
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you should drive and brake as you always have.
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you should pump the brakes to restore pressure.
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either the front or rear brakes will not be operating fully.
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the effect won't be noticeable for the first 50 miles.
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24.
In vehicles with air brakes, the air compressor governor:
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controls when the air compressor will pump air 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 how much air the air compressor will pump into the air storage tanks.
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None of the above.
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25.
Most heavy-duty vehicles use:
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dual air brake systems.
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pump-the-brake systems.
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single air brake systems.
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triple air brake systems.
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