CAR WAS COMPLETELY STOPPED. WHEN ENGAGED INTO REVERSE, CAR MADE LOUD NOISE, TIRES SQUEALED, ENGINE RACED AND CRASHED INTO PARKED CAR BEHIND IT AT HIGH RATE OF SPEED. PARKED VEHICLE THAT WAS STRUCK THEN STRUCK CAR NEXT TO IT SINCE IMPACT WAS SO GREAT. CAR WAS UNCONTROLLABLE, COULD NOT BE STOPPED VIA BRAKES.