the dual master cyl for disc/drum have residual valves built into the MC, I would see no problem in the pro valve being above the MC, if the rears won't bleed, a 2psi check valve can be installed in the line after the pro valve. In a message dated 10/18/2008 11:16:41 A.M. Eastern Daylight Time, neal.zimmerman@xxxxxxxxx writes: Hi all, got a question about my 64 Cudas brake upgrade. They did the disc brake upgrade and the car has a new safety valve(??)) or proportioning valve(??) ( I dont understand the difference) but it is signifigantly bigger than the factory block. BUT I dont like where its mounted , too close to the headers. can i move this to the fenderwell or does it need to be BELOW the master cylinder?? If i moved it to the fender well it would be almost level with the master cylinder, slightly lower , but not by much. neal zimmerman, eugene oregon **************New MapQuest Local shows what's happening at your destination. Dining, Movies, Events, News & more. Try it out (http://local.mapquest.com/?ncid=emlcntnew00000002) [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.