WAS DRIVING AT APPROXIMATELY 55-60 MPH ON INTERSTATE, ATTEMPTING TO SLOW DOWN WHEN BRAKE PEDAL BECAME STUCK, PEDAL DID NOT MOVE, CAUSING THE CONSUMER TO REAREND VEHICLE IN FRONT. HAD TO DOWNSHIFT AND USE EMERGENCY BRAKE IN ORDER TO STOP. 2 DAYS PRIOR TO INCIDENT, CONSUMER DID EXPERIENCE BRAKE PEDAL GETTING STUCK, BUT ONLY FOR 1 SECOND BUT THEN RELEASE ITSELF. DEALER CANNOT DETERMINE PROBLEM. *AK