Thanks Hisham..
Btw, my car always encountered vibrations while running arnd 80km/h - 90km/h..
I've checked my rims & its not dented.. Last time i did skim the front disc & the problem went away just for a while.. apparently its because of the "caplang" brake pads.. Now its starting to vibrate again.. Can this problem occured due to uneven brake disc?