HI, I OWN A 1992 LEXUS LS400 AND I SEEM TO BE GOING THROUGH BRAKES LIKE CRAZY, I REPLACED THE FRONT 2 ROTORS & PADS WITH LEXUS PARTS. THEN DROVE ABOUT 1000 MILES AND FRONT BRAKES STARTED TO VIBRATE AGAIN SO I WENT OUT AND BOUGHT 4 NEW DRILLED& SLOTTED ROTORS OFF E-BAY FOR $249 FOR ALL 4 WHICH MY MECHANIC THOUGHT WAS TO CHEAP TO BEGIN WITH, THEN AFTER ABOUT 500 MILES I STARTED TO HAVE THE SAME VIBRATION PROBLEM AGIAN ANYBODY HAVE ANY SUGGESTIONS?