Depends on what brakes you're running front & back, and how they're working for you. If you find you need to bias the brake pressure to keep from locking up the rear brakes first Summit has several different proportioning valves, like the single in, single out that you could mount in the common line going to the back to choke back on them a bit - Brake Proportioning Valves - SummitRacing.com If the MC is on the firewall or under the dash, above the wheel cylinders, then you don't have to worry with residual valves.