WHILE DRIVING 35 MPH VEHICLE SUDDENLY ACCELERATED, CONSUMER APPLIED BRAKES, BUT THIS DID NOT STOP VEHICLE. CONSUMER KEPT PUSHING BRAKE PEDAL TO FLOOR, AND AFTER A FEW SECONDS, VEHICLE SLOWED DOWN. MILEAGE WAS 3000. THIS HAPPENED AGAIN ON 4 AUG 2001 WHILE DRIVING ABOUT 5 MPH IN A PARKING GARAGE, VEHICLE ACCELERATED WHILE IN REVERSE. APPLIED BRAKES, BUT THERE WAS NO BRAKING ACTION. VEHICLE CAME TO A STOP WHEN IT HIT ANOTHER VEHICLE. DAMAGE TO JEEP WAS $5700.00, DAMAGE TO OTHER VEHICLE UNKNOWN AT THIS TIME. BOTH TIMES, NO INJURIES.*AK *SLC