Just purchased a granada disc brake setup for my 66 coupe from individual who has decided to take another route. Kit had in it rotors/calipers/spindles/pads and bearings. Laurel mountain mustang recommended a 67 master cylinder so I purchased this from them for 39$ new. Problem is that I have no granada proportioning valve and can't seem to locate one. After doing research, I found that I can tee front brake line just after master cylinder and put a manual (Summit) proportioning valve for rear brakes. Anyone do this and if so, pros/cons? Keep in mind that i cant locate the stock proportioning valve new, it is discontinued. Brian