2002 LEXUS LS430 Visibilityrearview Mirrorsdevicesexterior Problems

I WANTED TO WRITE TO EXPRESS MY EXTREME DISAPPOINTMENT IN MY LEXUS DRIVING EXPERIENCE. I CURRENTLY OWN A 2002 LEXUS LS 430 SEDAN THAT I PURCHASED ON DECEMBER 28, 2005. SINCE THEN, I HAVE HAD VERY SERIOUS PROBLEMS WITH MY BRAKING SYSTEM. FIRST, MY VEHICLE HAD BEEN IN THE SHOP 7 TIMES FOR MY BRAKES. THIS IS A VERY SERIOUS PROBLEM; MY EMERGENCY BRAKE COMES ON BY ITSELF. WHILE I AM DRIVING THE BRAKE LIGHT COMES ON, I MUST PULL OVER AND STOP THE VEHICLE AND PULL THE BRAKE BEFORE THE VEHICLE WILL MOVE AGAIN. MY VEHICLE HAD BEEN IN THE SHOP A TOTAL OF THREE WEEKS FOR THIS ONE PROBLEM THAT IS STILL ON GOING. EVERYONE IN THE MAINTENANCE DEPARTMENT HAS LOOKED AT MY VEHICLE THEY TELL ME THEY CAN NOT FIND OUT WHY THIS IS HAPPENING. FINALLY, THIS VEHICLE WAS A PRE-OWNED VEHICLE THAT WAS SUPPOSED TO HAVE...