AIR BRAKES PRACTICE TEST - CALIFORNIA
21.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
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450 psi.
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100 psi.
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125 psi.
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22.
The use of air brakes on a steep downgrade is only a supplement to:
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the use of the parking brakes.
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the use of the spring brakes.
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the braking effect of the engine.
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23.
When the wheels of a trailer lock up:
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ABS will increase stopping power.
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the vehicle will gradually come to a complete stop.
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the trailer will tend to swing around.
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24.
Combination vehicles have __ air lines.
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1
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2
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3
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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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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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