Hi all. So after searching, I read a thread not far below from a few years ago with the same issue...but the guy seemed to free his up but was unsure of how he did it. I have an 85 Capri RS with stack brake setup. I replaced all the old hard lines after finding a pin hole leaking large amounts of fluid in one of the hard lines near the rear during a brake job. This is what most likely caused the proportional valve to block off the rear. So now I cannot get anything to flow to the rear drums. Does anyone know a way to reset this? I do not want to replace this if I do not have to. Any advice is greatly appreciated. Thanks.