I have a 2001 S that has been lowered and has solid chrome 20" wheels. First I put new pads on the car..about a month later I started to get a bad shake in the steering wheel when I would brake

...so I changed the rotors and the brakes again..every thing was good for about two months and now the shake is back and is getting worse

...do I need special rotors that are slotted and drilled or is this a waste and is going to do this again..I think its the weight of the wheels..has anyone else had this problem with larger rims and if so any solutions...thanks