CDL AIR BRAKES PRACTICE TEST - WYOMING
11.
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 the tank pressure falls to the "cut-in" pressure.
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When you are conducting your pre-trip inspection.
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12.
Before starting down a hill, you should:
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release the accelerator and shift to Neutral at the same time.
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look for an escape route.
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apply the brakes hard.
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slow down and shift to a lower gear.
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13.
At 55 mph, the total stopping distance for vehicles with air brake systems traveling in ideal conditions is:
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over 250 feet.
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less than 150 feet.
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over 450 feet.
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less than 250 feet.
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14.
To test the low pressure warning signal, you should:
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shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal until the low air pressure warning signal comes on.
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pump the brakes while your vehicle is running.
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manually let the air out of your brakes and see if the signal comes on.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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15.
Your truck has a dual air system. If either system is very low on pressure:
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the low pressure warning signal will stop working.
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the ABS will not work properly.
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either the front or the rear brake will not be fully operational.
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the tractor protection valve will not work properly.
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