AIR BRAKES CDL PRACTICE TEST - OKLAHOMA
11.
The spring brakes come on:
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when you bring the vehicle to a complete stop right away.
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when main air pressure is lost.
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12.
If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
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loose.
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cracked.
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tight.
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13.
When the low air pressure warning light and buzzer first come on, you should:
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downshift and slow down.
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speed up to restore pressure.
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bring the vehicle to a safe stop right away.
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14.
You should check air pressure and temperature gauges:
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as often as is practical.
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at the beginning of each trip.
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at the end of each trip.
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15.
Before starting down a hill, you should slow down and shift down:
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so you can coast downhill.
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to a gear that will cause your engine to exceed its redline.
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to a speed that you can control without using the brakes hard.
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