I'm having hideous NVH issues with my RacingBrake 2-piece rotors, and their support has been worse than useless. Really hoping someone here can help me.
Before I bought them, I called RB asking if the OE pad would work with them. RB said it would work. It didn't. There was massive pulsation under braking when warm. I tried cleaning the rotors several times per their instructions. It helped for a few hundred miles, and then the problem gradually came back. Eventually, RB changed their tune, saying maybe the OE pad wasn't okay after all (oops, I guess). Porterfield was on their list of compatible pads, so I called them asking if the R4-S would work. Again, they said repeatedly that it would. I also called Porterfield and Good Win with the same question, and both gave me the green light. So I cleaned the rotors again and tried the R4-S. Same story: okay for the first few hundred miles, then NVH would start building up again. I cleaned the rotors AGAIN, with the same effect. The only difference is that instead of a steady pulsation, it's now a rumble that occurs when braking at 40+ MPH. But it's bad, and I'm genuinely worried about what it's doing to my car (not to mention my sanity).
It's also worth noting that whenever I contacted RB by email asking for advice, they were hugely evasive and often unresponsive. They only ever gave me real advice by phone. If that isn't suspicious, I don't know what is.
This was a $750 set of rotors after shipping, and RB isn't giving me a way out that doesn't involve pissing away even more money. I've already ruled out other problems with the suspension and brakes (all original and recently inspected), so either the rotors are defective or their directions were wrong; either way it's their problem, but they are refusing to own it. Their last advice to me was to either have the runout checked, or to have it checked locally -- either of which costs me time and money for a meaningless outcome. And I'm really not in the mood to keep throwing $200 pad sets at these rotors until one of them works.
Can someone help me here?