I already used the search function and am a little confused on the opinions/data from others. I am going to install an adjustable proportioning valve in my truck for the rear disc brakes. I would like to mount it right next to the master cylinder. But I don't know which line is front or rear out of the master cylinder. From what I read different master cylinders switch it front to rear resivoir. Is it the larger line or the smaller line for the rear brakes? And what sizes are those lines? I am also going to remove the stock proportioning valve and just "T" the front lines. Has anyone else done this?