AIR BRAKES CDL PRACTICE TEST - OHIO
11.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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20 to 45 psi
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100 to 120 psi
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10 to 20 psi
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12.
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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13.
Air tanks must be drained because:
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compressed air usually has some water in it. The water can freeze in cold
weather and cause brake failure.
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when you push the brake pedal, air is let into each brake chamber.
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if one air system is low on pressure, the rear brakes will not be operating fully.
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14.
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 lag.
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brake fading.
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reaction distance.
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15.
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 will be restricted to driving vehicles without air brakes.
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you'll need to take another knowledge test about air brakes.
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you'll have to immediately retake your test using another vehicle.
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