AIR BRAKES CDL PRACTICE TEST - KENTUCKY
6.
What is the best way to test the low air pressure warning signal?
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step on and off the brake pedal while the engine is running.
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Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
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pump the brakes until the air pressure drops below 45 psi.
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All of the above.
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7.
Too little weight on the driving axles can cause:
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poor visibility.
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longer stopping distances.
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poor traction.
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mechanical damage.
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8.
The air tanks should be drained completely to remove:
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water and oil.
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the radiator cap.
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carbon monoxide.
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air.
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9.
Before driving a vehicle with a dual brake brake system, the driver should:
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pump the brake pedal 10 times to build pressure.
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wait at least 10 minutes before driving.
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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wait at least 5 minutes before driving.
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10.
Which of the following is NOT correct? An ABS system:
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reduces the braking pressure to a safe level.
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helps you stop faster.
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is a safety anti-skid braking system.
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helps you avoid wheel lock up.
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