AIR BRAKES CDL PRACTICE TEST - NEBRASKA
21.
When the spring brakes are on, you should push the brake pedal down:
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Only when driving downhill.
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Only when driving uphill.
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Never.
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Only when approaching railroad-highway crossings.
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22.
The braking power of the spring brakes:
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depends on the brakes being in adjustment.
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is not affected by the condition of the service brakes.
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is not affected by the air pressure level.
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All of the above.
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23.
Under a pressurized system, the radiator cap:
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should be removed when the coolant is hot.
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should never be removed until the system has cooled.
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should always be cool.
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should never be hot.
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24.
A low air pressure warning signal is required on:
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all vehicles with air brakes built after 2009.
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Warning signals are optional.
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all vehicles with air brakes.
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all vehicles with air brakes built after 2005.
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25.
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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reduce exhaust emissions.
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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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