[dmjlambert]

That is interesting information. There's too much general information that's confusing, and not enough actual technical specifications about what is in each component. I understand the factory combination valves don't have residual valves, they just have the shuttle switch, metering valve (for 71 manual brakes they didn't have one, but for other applications they did), and proportioning valve. Who knows what is in the chinese brass block style replacement combination valves. I'm kind of doubting there are residual valves in there. The residual valves would have been in the master cylinder way back when, but there is other information on the internet about modern wheel cylinders not needing residual valves any more and who know the specs on the master cylinders they are selling in parts stores (or anywhere).