IL CDL AIR BRAKES PRACTICE TEST
11.
Air pressure should build up in a single air system, within about:
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10 minutes.
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15 minutes.
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3 minutes.
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1 minute.
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12.
When the spring brakes are on, you should never:
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push the brake pedal down.
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decrease your speed.
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upshift.
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change lanes.
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13.
Vehicles with air brakes require more stopping distance than vehicles with hydraulic brakes. Why?
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Air brakes use different brake drums.
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When driving vehicles with air brakes, the average perception distance increases from 400 feet to 2200 feet.
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It takes one half second or more for the air to flow through the lines to the brakes.
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Stopping distance for vehicles with air brakes is made up of six different factors.
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14.
You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
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you won't receive a CDL.
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you'll need to take another knowledge test about air brakes.
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you will be restricted to driving vehicles without air brakes.
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you'll have to immediately retake your test using another vehicle.
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15.
Air brakes:
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can improve fuel efficiency.
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should be used only when driving on wet roads.
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are an effective way to stop large and heavy vehicles.
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are prohibited on larger vehicles.
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