CDL AIR BRAKES PRACTICE TEST - IOWA
21.
The Johnson bar is a valve that:
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works the trailer brakes.
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reduces the braking pressure to a safe level.
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is installed in the first tank the air compressor pumps air to.
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22.
Which of the following is NOT correct? An ABS system:
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helps you stop faster.
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helps you avoid wheel lock up.
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is a safety anti-skid braking system.
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23.
ABS helps you:
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increase your normal braking capability.
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steer gently and smoothly while you are braking.
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avoid wheel lock up and maintain control of your vehicle when you brake.
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24.
The total stopping distance for vehicles with air brake systems is made up of __ different factors.
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3
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2
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4
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25.
With the controlled braking method, you:
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apply the brakes as hard as you can without locking the wheels.
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push down on the brake pedal as hard as you can so that the wheels the lock up.
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apply the brakes all the way and release brakes when the wheels the lock up.
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