MICHIGAN CDL AIR BRAKES PRACTICE TEST
16.
If the air pressure gets too low:
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the brakes will lock up.
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the brakes will not work.
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ABS will help maintain vehicle control.
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17.
The safety valve is usually set to open at:
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100 psi.
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150 psi.
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200 psi.
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18.
If a load is placed on one side of the trailer:
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making turns may be easier.
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the steering axle weight will be too light to steer safely.
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a rollover is more likely.
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19.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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air escaping from the open valve.
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the service line valve close.
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a mechanical vibration.
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20.
If your ABS malfunctions:
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the service brake will not work.
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you should immediately come to a complete stop.
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you still have normal brake functions.
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