TRUCK WAS PARKED AT HOME ON A HILL. I PUT IT IN REVERSE AND STARTED TO BACKUP WHEN THE BRAKES COMPLETELY FAILED CAUSING ME TO GO INTO A TREE. THIS CAUSED DAMAGE TO THE REAR DRIVERS SIDE QUARTER PANEL. BRAKE FLUID IS LEAKING FROM THE BRAKE LINE IN THE REAR OF THE VEHICLE. VEHICLE WOULD NOT SHIFT BACK INTO PARK. I HAD TO SHUT THE VEHICLE OFF AND NOW CALLING A TOW TRUCK. *TR