Tommy, are you referring to having (2) master cylinders or one master with two outlets, as I have actually seen pictures of "old" masters with a single line. Anyway, I am using a single master and an adjustable proportioning valve from summit. My plan was to run a line from the master, to the line loc then from the loc to a "T" fitting connected to the front brakes and run the other line from the master to the prop valve and then to the rear brakes. It seemed like the logical thing but wanted to run it by someone that has experience with this. thanks for any help...wannabe