TL*THE CONTACT OWNS A 2007 LEXUS RX350. THE CONTACT WAS DRIVING APPROXIMATELY 15 MPH ON NORMAL ROAD CONDITIONS; HOWEVR, IMMEDIATELY AFTER APPROACHING A TRAFFIC SIGNAL HE HAD TO ENGAGE THE BRAKES WITH AGGRESSIVE FORCE SEVERAL TIMES. THE VEHICLE FAILED TO SLOW DOWN AND REAR ENDED THE PROCEEDING VEHICLE. THE POLICE WAS CALLED TO THE SCENE. THERE WERE NO INJURIES OR DAMAGES TO THE VEHICLE. THE VEHICLE WAS DRIVEN WITH CAUTION TO THE RESIDENCE AND TOWED TO AN AUTHORIZED DEALER. THE TECHNICIAN REFUSED TO INSPECT THE VEHICLE AND INFORMED HIM THAT THE MANUFACTURERS ENGINEER WOULD PERFORM AN INVESTIGATION. THE MALFUNCTION HAS NOT BEEN DETERMINED AT THIS TIME. THE FAILURE MILEAGE WAS 57,000. THE VIN WAS UNAVAILABLE.