I WAS PARKED IN THE UNDERGROUND PARKING AT THE NORTH WEST CORNER OF AMHERST AVE AND SANTA MONICA BLVD IN LOS ANGELES. I WAS EXITING DRIVING UP THE VERY NARROW EXIT RAMP. 1.THE ONE WAY EXIT TO THE LOT CURVES AND IS VERY NARROW. AS I NAVIGATED THE NARROW EXIT, I FELT THAT I WAS ALMOST TOUCHING THE WALL ON THE RIGHT SIDE. 2.I APPLIED THE BRAKES AND PUT THE CAR IN REVERSE IN ORDER TO GET AWAY FROM THE WALL. HOWEVER, THE BRAKES DID NOT RESPOND AND THE CAR ROLLED BACKWARDS AROUND THE BEND, HITTING THE WALL BEHIND ME. THE CAR CAME TO A COMPLETE STOP. 3.APPLYING THE BRAKES HAD NO IMPACT ON THE CAR NEITHER DECELERATING NOR ACCELERATING. THIS SHOWS THAT THE BRAKES DEFINITELY DID NOT WORK. 4.WITH MY FOOT ON THE BRAKES, I PUT THE CAR IN DRIVE. AT NO TIME DID I PRESS THE ACCELERATOR PEDAL. I WOULD HAVE HEARD THE ENGINE. THE INSTANT I SHIFTED TO DRIVE, THE CAR LUNGED FORWARD AT A VERY HIGH RATE OF SPEED. CONSEQUENTIALLY, MY CAR ZOOMED UP THE DRIVEWAY INTO THE GROUND LEVEL PARKING FACING WEST. WITHIN A SECOND OR SO, MY CAR COLLIDED WITH ANOTHER CAR, PARKED FACING WEST IN FRONT OF PIZZA HUT. DUE TO THE FORCE OF THE IMPACT AT SUCH A HIGH RATE OF SPEED, THE PARKED HYUNDAI SUPERSEDED THE CONCRETE PARKING BARRIER CRASHING INTO PIZZA HUT, SHATTERING THE STORE FRONT WINDOW. 5.MY CAR WAS THANKFULLY STOPPED DUE TO IMPACT WITH THE HYUNDAI ON THE RIGHT SIDE OF MY VEHICLE AND A LOW WALL ON THE LEFT SIDE.