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I could be TOTALLY wrong here but my understanding is that the terms engine or exhaust brake is synonymous with a Jabob's brake in that Jacob is just the name of the company that designed the technology. The other term we hear about which is entirely different is a transmission brake/retarder that is seen on some older Prevost coaches. Don't know if Newell ever employed a trans brake, but haven't heard anyone talking about it around here so i'm assuming they didn't, at least not on S60 coaches and newer.