I've been asking about the Quad4 brake swap for years. I sent a letter in several years ago (2001 IIRC), and got a 'tabled for further research' response. Never heard anything more. Jeff, Is there any reason that you have to wait for a letter? Why, as a member of the ITAC, can't you take a pro-active approach with this? I think this will be an interesting situation to watch. I'm curious as to how it will be handled by the CRB.