MO CDL AIR BRAKES PRACTICE TEST
21.
To apply the parking brakes:
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push the parking brake control knob in.
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place the parking brake control knob in Neutral.
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pull the parking brake control knob out.
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22.
Excessive use of the service brakes results in overheating and leads to:
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brake fade.
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reduction of the brake drums.
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poor traction.
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23.
A passive railroad crossing is one that:
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requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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has a traffic control device installed at the crossing to regulate traffic.
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does not have any type of traffic control device.
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24.
Before starting down a hill, you should slow down and shift down:
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to a gear that will cause your engine to exceed its redline.
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so you can coast downhill.
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to a speed that you can control without using the brakes hard.
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25.
Air tanks must be drained because:
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when you push the brake pedal, air is let into each brake chamber.
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if one air system is low on pressure, the rear brakes will not be operating fully.
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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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