after warmin the brakes up, they tend to groan/chatter at low speeds. it's only at like 2mph or less. I got some nice, pricey ceramic pads hopin to cure it, but no luck.

I replaced the rotors a few months ago with stock repl. because they were warping, and they worked great until recently.

I'm thinkin its the rotors as they're a funky color, but I just repleced them(not even 6 mon. ago). Maybe the cheap pads fragged them early. Deliverin pizza's is just plain hell on my brakes and I need them in top shape.

Oh, they are stock brakes fyi.