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Politics : Politics for Pros- moderated

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To: DMaA who wrote (295414)	3/7/2009 5:11:19 PM
From: Alan Smithee	1 Recommendation Read Replies (2) of 793868

Apparently it is the practice of downshifting to use the engine compression to slow down rather than using your brake Actually, it's a little more complicated than that. A Jake Brake is an actual compression release device that acts to slow the truck. Oral could probably explain it better. en.wikipedia.org youtube.com They make a lot of noise, which has caused some municipalities to bar the use of Jake brakes in town. Compression release engine brakes may make a loud chattering or "machine gun" noise while being used, which has led many communities in the United States to ban them. There are signs on the side of some freeway offramps, or at municipal boundaries, that will say "Brake Retarders Prohibited", "Engine Brakes Restricted", even going as far to say "No Jake Braking", etc. These signs are referring to compression release engine brakes. This has led to special mufflers on trucks that also muffle the sound of the compression release engine brake. Also, some engines use a butterfly valve in the exhaust and/or stator travel beyond the normal operating range on the variable-geometry turbocharger to produce engine braking without the noise associated with a compression release engine brake.

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