WHILE APPLYING THE BRAKE PEDAL VEHICLE ACCELERATED UNCONTROLLABLY. DRIVER CONTINUED TO APPLY THE BRAKE PEDAL AND THE VEHICLE FAILED TO STOP COMPLETELY. THIS CAUSED THE VEHICLE TO COLLIDED INTO THE VEHICLE IN FRONT. VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION, BUT MECHANIC COULD NOT DUPLICATE THE PROBLEM. HOWEVER, THE PROBLEM RECURRED. *AK SECOND FAILURE OCCURRED WHILE BRAKING FOR A STOP SIGN. THE VEHICLE CONTINUED TO ACCELERATE AN RAN INTO THE BACK OF A PICKUP TRUCK. THERE WAS NO DAMAGE TO PICKUP EXCEPT THAT THE VEHICLE'S HOOD WAS CAUGHT IN A TRAILER HITCH ON THE PICKUP. *BF *NM