AIR BRAKES CDL PRACTICE TEST - NEVADA
21.
The most common foundation brakes found on vehicles with air brakes are the:
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disc brakes.
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S-cam brakes.
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wedge brakes.
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parking brakes.
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22.
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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compressed air usually has some water in it. The water can freeze in cold
weather and cause brake failure.
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if one air system is low on pressure, the rear brakes will not be operating fully.
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if you don't drain the tanks yourself, your battery fluid may drain out.
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23.
Which of the following can cause brakes to fade or fail?
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Brakes out of adjustment
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Not relying on the engine braking effect
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Excessive use of the service brakes
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All of the above.
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24.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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high and low.
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normal and slippery.
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wet and dry.
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left and right.
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25.
When you make a quick lane change, the crack-the-whip effect can:
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improve your traction.
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the trailer to swing wide to the left.
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turn the trailer over.
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make it harder to turn without skidding.
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