OK CDL AIR BRAKES PRACTICE TEST
16.
In vehicles with air brakes, the brake pedal:
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let the
air out of the spring brakes.
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tells you how much pressure is in
the air tanks.
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controls the air pressure applied to the brakes.
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17.
In some vehicles a modulating control valve may be used to:
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decrease the pressure in the brake system.
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apply the front brakes.
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apply the spring brakes gradually.
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18.
Pressing and releasing the brake pedal unnecessarily can:
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causes friction, which slows the vehicle.
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apply more air pressure.
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let air out faster than the compressor can replace it.
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19.
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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45
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12
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20
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20.
When a tire fails, you must:
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hold the steering wheel firmly.
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stay off the brake.
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All of the above.
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