AIR BRAKES PRACTICE TEST - CONNECTICUT
16.
The parking or emergency brakes of trucks or buses must be held on by:
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fluid pressure.
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air pressure.
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hydraulic pressure.
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spring pressure.
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17.
An ABS system:
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keep your wheels from locking when you brake hard.
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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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18.
When a tire fails, you must:
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get out and check all the tires after you have come to a stop.
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stay off the brake.
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hold the steering wheel firmly.
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All of the above.
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19.
To test the low pressure warning signal, you should:
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pump the brakes while your vehicle is running.
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check the air hoses connected to the brake chambers to make sure they aren't cut.
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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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manually let the air out of your brakes and see if the signal comes on.
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20.
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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the service line valve close.
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a mechanical vibration.
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air escaping from the open valve.
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a thumping sound.
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