CDL AIR BRAKES PRACTICE TEST - MICHIGAN
21.
When the wheels of a trailer lock up:
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the trailer will tend to swing around.
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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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22.
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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23.
Brake lag is:
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the time required for the air brakes to work after the brake pedal is pushed.
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the amount of air pressure required to stop the vehicle.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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24.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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12
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45
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20
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25.
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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