OR CDL AIR BRAKES PRACTICE TEST
11.
You are driving on a steep downgrade. If your safe speed is 35 mph, you should apply the brakes when your speed reaches:
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25 mph
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45 mph
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35 mph
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30 mph
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12.
The braking power of the spring brakes:
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depends on the brakes being in adjustment.
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is not affected by the air pressure level.
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is not affected by the condition of the service brakes.
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All of the above.
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13.
In some vehicles a modulating control valve may be used to:
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apply the parking brake.
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apply the front brakes.
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apply the spring brakes gradually.
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decrease the pressure in the brake system.
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14.
Air tanks must be drained because:
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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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if you don't drain the tanks yourself, your battery fluid may drain out.
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if one air system is low on pressure, the rear brakes will not be operating fully.
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when you push the brake pedal, air is let into each brake chamber.
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15.
Some air brake systems have an alcohol evaporator. Checking the alcohol container and filling it up as necessary:
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reduces the risk of having an accident due to drowsy driving.
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reduces the risk of ice in air brake valves during cold weather.
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helps keep the engine cool, as well as lubricating it.
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helps you avoid wheel lock up.
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