Not saying you're wearing out brakes faster, but that is a fact of the problem for the front since the back isn't doing anything, but your front brakes are doing all the work and somehow you aren't seeing that as a problem..
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All a RP valve would do for me is to eliminate the double pump which is necessary when the piston pulls into the caliper. Thing is I don't have to do a double pump, which means the piston isn't retracting into the caliper.
A RP has no effect on brake bias as you are claiming.
