CO CDL AIR BRAKES PRACTICE TEST
16.
The braking power of the spring brakes:
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is not affected by the air pressure level.
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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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All of the above.
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17.
The safety relief valve is located:
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on each end of the vehicle's axles.
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in the front brake.
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in the first tank the air compressor pumps air to.
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on the dashboard.
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18.
Which of the following is TRUE about dual air brake systems?
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most heavy-duty vehicles use dual air brake systems.
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A dual air brake system has 2 separate air brake systems.
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Each brake system has its own air tanks, hoses and lines.
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All of the above.
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19.
If stopped on a hill, how can you start moving without rolling back?
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Partly engage the clutch before you take your right foot off the brake, put on the parking brake if necessary.
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Release the parking brake before you have applied enough engine power to keep from rolling back.
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Press on the gas pedal, even if you have to roll back a little.
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None of the above.
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20.
Emergency brakes are:
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required on all vehicles.
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not required on doubles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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