Walt - After all I have been through on my brakes, it seems as if replacing the rear cylinders is the first thing I should have tried. Who knew? I'll be home for Christmas and will try to squeeze in some car time. When I left, the car was stopping pretty well with the residual pressure valve, but I am definitely swapping the rears now too.
I don't know if the switch interacts with the metering or proportioning function in the valve, but you may want to fix it before you find out the wrong way. The techs at Inline Tube told me it can interfere with the bleeding, so who knows? Let us know when you get that figured out.
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