I went to park my mom's car. Tapped the brakes, moved up a little, tapped the brakes again-the brakes gave out and the car lunged forward at a high speed. The only reason I stopped was because a metal fence stopped me. Earlier in the day the car switched modes by itself from Sport to Economy. This is the 2nd time this has happened in this car. The first time my mom was parking in her driveway and the brakes gave out and the car lunged into her garage. This car is not safe.