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Regarding Williams vs Pacbrake, N.C. Williams patented the exhaust brake back in '57 (#2805656), but patents expire and in general, anybody can copy the idea after 17 years after the issue date. Trademarks/names have indefinite lifetimes, though since they can be renewed by the "owner".

El cheepo here found one in a muffler shop for $10 . Cleaned it up and it worked great. The other one (on the right) in the image operates on a vacuum and came from ebay (about $80). Didn't use it and sold it again on ebay. Diesel trucks may have a vacuum pump in tandem with the alternator for...

A question came up on the ex-brake. Here are some detail images. The exhaust brake is useful when going downhill with a heavy load. It helps slow you down (it's an engine brake) and works best when the rpm is high. The back pressure is multiplied by the rpm for the braking horsepower. Back...