CDL AIR BRAKES PRACTICE TEST - WASHINGTON
16.
At 55 mph, the total stopping distance for vehicles with air brake systems traveling in ideal conditions is:
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over 250 feet.
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less than 250 feet.
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over 450 feet.
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17.
Front brake limiting valves were used to:
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reduce the chance of the front wheels skidding on slippery surfaces.
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prevent overheating of the front tires.
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reduce your speed so further braking or shifting is not required.
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18.
The safety valve is usually set to open at:
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200 psi
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125 psi
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150 psi
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19.
What is the best way to test the low air pressure warning signal?
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pump the brakes until the air pressure drops below 45 psi.
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Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
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step on and off the brake pedal while the engine is running.
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20.
In a vehicle with a dual air brake system:
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each system has its own air tanks.
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one system supplies air to the trailer.
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both systems typically operate the regular brakes on the rear axle.
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