SLOWLY PULLING STRAIGHT INTO PARKING SPOT AT GROCERY STORE. APPLIED BRAKE WHEN CAR SUDDENLY ACCELERATED. I WAS ABLE TO CONTROL STEERING, BUT BRAKES WOULD NOT WORK. STEERED CAR INTO EMPTY PARKING SPOT IN FRONT OF ME THEN TURNED HARD RIGHT TO AVOID HITTING PARKED CARS IN ROW ACROSS. SUBARU HIT A PICK UP TRUCK THAT WAS REVERSING OUT OF A DIAGONAL PARKING SPOT. THE CAR DIDN'T STOP UPON IMPACT, INSTEAD BOTH RIGHT SIDE WHEELS CLIMBED UP THE SIDE OF TRUCK AT AN ANGLE. AIR BAGS DIDN'T DEPLOY ON IMPACT. THIS WAS A VERY DANGEROUS SITUATION. THE ACCELERATION WAS UNCONTROLLABLE AND I AM AFRAID TO DRIVE THE CAR.