CDL AIR BRAKES PRACTICE TEST - NORTH DAKOTA
6.
If the air tanks are not drained:
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your speed must be reduced to 5 MPH below your “safe” speed.
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the water can freeze in cold
weather and cause brake failure.
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the air pressure in the tanks is reduced.
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the spring brakes will come on.
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7.
_________ must have a low air pressure warning signal.
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All vehicles with air brakes
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Vehicles with air brakes built after 2010
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Vehicles with air brakes built after 2005
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Only vehicles with air brakes built before 2015
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8.
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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When you are conducting your pre-trip inspection.
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When the tank pressure falls to the "cut-in" pressure.
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Only while you are taking a rest break.
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9.
Air tanks must be drained because:
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if one air system is low on pressure, the rear brakes will not be operating fully.
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if you don't drain the tanks yourself, your battery fluid may drain out.
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when you push the brake pedal, air is let into each brake chamber.
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compressed air usually has some water in it. The water can freeze in cold
weather and cause brake failure.
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10.
With brake drums, if brakes become too hot:
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your ABS will malfunction.
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the brakes will supply too much power to the drive wheels.
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The brakes may stop working
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the air compressor will kick on to cool the brakes.
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