Here is my personal experience so take it FWIW. We thought the pedestal was leaking so we changed that set of O-rings. Still leaked. Rebuilt the EBPV with the kit. Still leaked. Got a new EBPV. Still leaked. Another one and finally it quit. Why? I suspect because the bore was scored and changing the piston would not help. When they gave a rebuilt one to be installed from the parts dept, they just changed the rubber plunger which did not fix the bore. Talked to another tech who had 3 rebuilt pedestals before they found one that would NOT leak.