*imperial - like i've said, already brought it 3x sa casa. and i asked for brake pad replacement. the sound is now gone! great! :D
*albert - rear wheels. as loud as it is, you can quickly identify where it's coming from even if you just open the windows.
*altec - mine doesn't have a grinding sound, just a squeal/moan

that's what i did the first time around, waited for the first 5k, but they just said they'll clean it and it'll go away, hope it's all good for you come the 5k.
anyways, hopefully these new brake pads would do the trick. :D