Most likely it's a warped rotor. Depending how bad it is they can resurface the rotor and correct the problem. If they can't resurface it, you'll have to get new rotors.
you DEFINITELY need balance and rotation, if that little thing came off. My lude used to shake when i braked too, so i got a rotation and balance, and BOOM! it work!<font face="Verdana, Arial" size="2">Originally posted by icf102:
when i got my new tires put on i noticed one of those little weight thingys on the rim was loose and fell off at some point, could that be it then if you say my wheels might be out of balance?
Ian</font>