AIR BRAKES CDL PRACTICE TEST - RHODE ISLAND
11.
In a dual air brake system, if one air system is very low on pressure:
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you should pump the brakes to restore pressure.
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either the front or rear brakes will not be operating fully.
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you should drive and brake as you always have.
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12.
In some vehicles a modulating control valve may be used to:
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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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13.
If the air tanks are not drained:
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the water can freeze in cold
weather and cause brake failure.
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your speed must be reduced to 5 MPH below your “safe” speed.
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the air pressure in the tanks is reduced.
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14.
When driving in a construction zone, if a construction worker is near the road, you should:
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come to a complete stop.
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maintain a constant speed.
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further reduce your speed.
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15.
Vehicles with air brake systems take longer to come to a complete stop than vehicles with hydraulic brakes because of:
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brake fading.
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brake lag.
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reaction distance.
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