2001 Lexus IS 300

Brakes problem
2001 Lexus IS 300 6 cyl Two Wheel Drive Automatic

i recently change my rotor and brakes like a week ago due to the problem that my car shakes when i'm about to stop. Well I put in new rotors and brakes pad in and than start driving to work for a day or 2. All suddenly mit starts to shake again. I'm confuse and need to know what is the problem. Do I need to change anything out? Or do I need to buy something for it?
October 6, 2010.

Check out the related content below while we wait for the question to be answered by a professional mechanic.