CDL AIR BRAKES PRACTICE TEST - NORTH DAKOTA
21.
The supply pressure gauges tell you how much air pressure:
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you are applying to the brakes.
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is going to the brake chambers.
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is in the air brakes.
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is in the air tanks.
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22.
In some vehicles a modulating control valve may be used to:
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apply the front brakes.
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decrease the pressure in the brake system.
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apply the parking brake.
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apply the spring brakes gradually.
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23.
Front brake limiting valves were used to:
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reduce your speed so further braking or shifting is not required.
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prevent overheating of the front tires.
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce exhaust emissions.
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24.
Before driving a vehicle with a dual air system, the air compressor should build up a minimum of _____ pressure in both the primary and secondary systems.
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75 psi
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100 psi
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50 psi
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10 psi
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25.
Excessive use of the service brakes results in overheating. Too much heat can:
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cause the brakes to grab.
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cause the brakes to squeak.
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make the brakes stop working.
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cause the brakes apply unevenly.
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