I'm late to the game here but if you still have the Maxbrake and are willing to part with it I would love to have it.This is the one I have.
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I've honestly not ever considered selling it, one of those things once its gone I likely won't ever get one back. But I have been happy enough with the factory brake controller I don't see going to anything else. I'd entertain sending it to a good home. If it's something your interested in I can give you a call.