[majorscooby]

Ok heres the problem and could use alittle advice please.
I have recentley fitted some black diamond drilled and grooved front discs on me wagon with (and i think this could be the prob) some blueprint brake pads from scs. "arrrggghhh why oh why i here you say". well to be honest i was quite happy with the braking performance on previous cars and thought sod it they should be fine they must be made to the same spec as the originals from the subaru dealer. But what i am experiencing is a viabration under braking from about a ton, but not hard braking gentle progresive braking and the viabration is not really through the steeering wheel more so through the pedal. its not a big harsh vibe,its asif you could imagen the grooves passing the pads as it were
im thinking could it be the fact that i now have grooved discs and brake pads with a nice slot in that are not quite bedded in yet just causing the vibe OR is something warming up and distorting i.e crap pads.
Your thoughts and knowledge would be gratfully recieved and recomendations for new pads please. (standard 4 pot calipers on a 05 wrx)
thanks richard