IN CDL Air Brakes Practice Test
11.
Empty trucks:
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have less traction.
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are higher than loaded trucks.
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require greater stopping distances.
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All of the above.
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12.
What should you do to test your vehicle's low air pressure warning signal?
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With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
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Pump the brakes until the air pressure drops below 80 psi.
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13.
The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:
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it is a safe-driving brake.
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it applies a "Shock" to the brakes.
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it is shaped like the letter "S".
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"S" stands for "Shoes".
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14.
When the spring brakes are on, you should push the brake pedal down:
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Never.
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Only when driving uphill.
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Only when driving downhill.
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Only when approaching railroad-highway crossings.
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15.
If you must drive through a deep puddle you should:
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speed up to get through the puddle as quickly as possible.
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apply the brakes until your speed reaches 40 mph.
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slow down and place transmission in a low gear.
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start slowly and Speed up smoothly and gradually so the vehicle does not jerk.
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