You guys could confuse a genius.The pushrod I'm talking is the one entering the mc.Natually it cant push the internals but should just touch.If the internals back off to the retainer clip that hold them in then expansion doesn't even come into play.I don't care if the mc is merc somebody makes the parts and that could be a hair different.Did the mc get bench blead before install?Has the fluid been pushed backwards a lot while changing pads,thats a no-no.Everything is designed buy smart people,second guessing will drive us nuts,in my case its a short drive.Pops