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I have a weak engine brake and don’t know why. It’s so weak, I didn't think it was working. The first trip to a Cummins Service Center said it just needed a software update.  But aterwards, I still couldn’t feel the engine brake.  

Newell hooked up a computer and said the engine brake was very weak.  Now it’s back to another Cummins Service Center and I waiting for the diagnoses.  Has anyone else had this problem?