[TargaT]

Hi I have 320 calipers on my race car. When I bought the car it cam with a bunch of new spare parts. I install new drilled rotors and porterfield pads. After a couple of sessions I was getting bad brake chatter. I just took them apart and found the rotors warped and the pads worn unevenly either front to back or top to bottom ie tappered. Not sure why this is happening? I notice the pistons on the 320 calipers are not fully 360 deg. on the mating surface. Could this be putting uneven pressure on the pads. Does the raised part of the piston need to be in a specific location? Any other thougths?

I just ordered some new solid rotors and pads. My old pads are still very meaty. Should I just try to surface them to flat?