AS I MADE A RIGHT TURN TO THE PARKING SPOT WITH MY RIGHT FOOT ON THE PEDAL I SLOWED DOWN TO 2-3 MPH WITH FOOT STILL ON THE BRAKE. AT ABOUT 1-2 FEET FROM THE CONCRETE RETAINING WALL LIMITING THE PARKING SPOT I PRESSED ON THE BRAKE FOR THE FINAL STOP. CAR ACCELERATED WILDLY AND HIT THE CONCRETE RETAINING WALL AHEAD. MY FOOT HAD NEVER LEFT THE BRAKE. AIR BAGS DID NOT INFLATE. THE VEHICLE WAS IN MOTION 2-3 MPH, ON A PARKING LOT. ACCELERATION HAPPENED WHEN I WAS BREAKING.