AIR BRAKES PRACTICE TEST - ALASKA
16.
To test the service brake:
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gently try to pull forward with the trailer parking brake on, then release the brake.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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push the brake pedal firmly while going about 5 mph.
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17.
Front-end header boards:
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should never be used.
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protect drivers from cargo in case of an accident or emergency stop.
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protect drivers from spilled cargo.
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18.
An anti-lock braking system (ABS):
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helps you avoid skids caused by over braking.
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helps you avoid wheel lock up.
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All of the above.
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19.
The stop light switch:
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turns on the brake lights when you put on the air brakes.
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warns you when the air supply pressure drops below 55 psi.
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tells you when you need to use your parking brake instead of the service brake.
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20.
If the low pressure warning signal doesn't work:
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this could cause sudden emergency braking in a single-circuit air system.
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you could lose air pressure and you would know it.
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None of the above.
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