2003 MURANO WAS STOPPED. DRIVER HAD FOOT ON BRAKE. VEHICLE WAS STRUCK IN REAR. BRAKE PEDAL WENT TO FLOOR AND VEHICLE ROLLED THROUGH INTERSECTION. HAD TO PUMP BRAKE PEDAL TWICE BEFORE BRAKES WOULD HOLD AGAIN. EVER SINCE, VEHICLE LABORS AS IF PULLING A HEAVY LOAD OR AS IF PARKING BRAKE WAS PARTIALLY ENGAGED. NISSAN DEALER STATES THAT BRAKES SEEM TO WORK, THEREFORE THEY WILL NOT ATTEMPT TO FIND CAUSE OF PEDAL-TO-THE FLOOR INCIDENT OR CAUSE OF VEHICLE "LABORING". *JB