Wow!!! I had no idea that the position of the residual valves would bring up so much discussion. I called "MP Brakes" over in North Carolina. They said that "anywhere down stream of the M/C is OK". To be more specific, I asked. "So, one can put the residuals valves either before or after the protortioning valve, correct"? Their answer was, "yes". I believe Grigg has it right. My old M/C setup has the residual valves before the proportioning valve and I'm going to keep it that way with the new one. It will save me time and effort re-plumbing. Thanks