Roughly how much do Jake brakes reduce stopping distance on semi trucks?

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Answers:

If you are legally blind and on SSI benefits will they cut off if you get a drivers license?

Engine brakes reduce the need for using service brakes. A 6% grade that would require my using the brakes all the way down at 40 mph wouldn't require me to use the service brakes at all when I engage my engine brake in the proper gear. I can descend the same grade and never touch my brakes at 40 mph leaving me with cool brakes should I need them in an emergency. The amount of engine braking available to me at any given speed is dictated by the gear I am in so stoppping distance will vary. The lower the transmission gear gives me more engine braking.

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Why are semi-trucks so inconsiderate on the highway?

That's not their point - the service brakes can lock up the wheels so additional braking power is superfluous. Their real purpose is to lessen wear and heating on the brake pads. And for that, they slow the vehicle at about the same rate as a light pressure on the brakes. Using just the Jake, it would take about eight times as far to stop.

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Why do you people in cars pullout in front of tractor-trailers that are hauling 80,000 pounds?

compression gives a motor its power a jake brake holds the exhaust vavle open and lets the compression exscape through the exhaust witch takes a way power.

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Why do I get disrespect when I drive my Beemer?

they are used to save brakes not replace or stop faster than.
Slows about twice as fast as no throttle deceleration

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Can anyone direct me to a website that sells 6-8" traffic/safety cones w/majority of body cut out?

The Jake brake minimizes the use of the congenital brakes, reduces overheating and fading on steep grades, reduces wear on brake shoes. they are much safer than trucks without them. engines on loaded semis have little back pressure without a Jake brake while descending down a long say, 7% grade when geared down and brakes can get very hot to the extent that the Drum expands and the brakes fade or fail. Jake brakes are life savers.

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