CDL AIR BRAKES PRACTICE TEST - TENNESSEE
6.
The most common foundation brakes found on vehicles with air brakes are the:
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wedge brakes.
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parking brakes.
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disc brakes.
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S-cam brakes.
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7.
When the spring brakes are on, you should push the brake pedal down:
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Never.
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Only when driving downhill.
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Only when driving uphill.
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Only when approaching railroad-highway crossings.
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8.
If your vehicle does not have automatic air tank drains, how often should you drain air tanks to remove moisture and oil?
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Once a week.
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At the end of each working day.
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Every 4 hours.
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At least once a month.
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9.
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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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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check the air hoses connected to the brake chambers to make sure they aren't cut.
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10.
Supply pressure gauges tell you:
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when the air pressure in the tanks falls below 60 psi.
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how much air pressure you are applying to the brakes.
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how much pressure is in the air tanks.
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when the pressure in the system drops below 60 psi.
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