I brought a set of ap 330 discs and modified 2wd calipers from a friend of a friend of a friend sort of thing for my 2wd cossie. Iv had them sitting around for ages and finaly got round to fitting them just before Xmas but since fitting them I'm gettin very very bad brake judder through the steerin to the point it feels like the dash is gonna fall out lol.

Could it be the discs warped or could it be something different causing it?

Thanks