I have always wondered what those loud noises are the semi-trucks make as they appear to be slowing down, but I don’t understand how that helps?
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What you are referring to is Engine breaking. The main purpose of this is to slow the vehicle down without using the breaks (extended use of the breaks can cause them to heat up and eventually fail).
There are two different methods of using the engine to break. Engine breaks, which open cylinder valves at a different timing, allowing the engine to waste work rather than generate it. The second option is the use of a Jake Break, which is basically a valve that restricts the exhaust flow, resulting in the wasting of work.
In order for either system to work the truck needs to be in the correct gear which results in downshifting while slowing down.
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