CDL Air Brakes Practice Test - Maine
16.
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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17.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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Never.
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Only while you are taking a rest break.
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When you are conducting your pre-trip inspection.
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18.
Most heavy duty vehicles use ___ air brake systems for safety.
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single
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dual
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triple
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19.
An ABS system:
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gives you more control over the vehicle during braking.
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helps you avoid skids caused by over braking.
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All of the above.
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20.
One way to prevent hydroplaning is to:
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make sure you have enough tread on your tires.
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take curves at higher speeds.
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have less than 4/32 inch tread depth in every major groove on front tires.
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