BRAKE SYSTEM FAILURE. PRIVATE MECHANIC LOOKED AT VEHICLE AND COULD NOT DETERMINE A REASON FOR FAILURE. CONSUMER DRIVING AT APPROXIMATELY 30 MPH WHEN SHE REARENDED ANOTHER VEHICLE IN FRONT OF HER AT A STOP LIGHT. BRAKES WERE FUNCTIONAL 2 MONTHS AFTER ACCIDENT, THEN FAILED AGAIN. ERRATIC OPERATION WITH BRAKE FAILURE 3 TIMES. *AK