On XXX; I drove to [XXX] from [XXX], with a friend for a luncheon. I pulled into the restaurant parking lot to park my car. It was a sunny day and the parking lot was paved. I made a right turn into a parking space, I was applying the brakes and coasting into the space. I was about 1/3 of the way into the space when I felt the loss of brake tension. Then the car revs loudly; suddenly and unexpectedly the car accelerates forward as I was still pressing down on the brakes. I pushed the brakes as hard as I could until the car stopped, but not until it had jumped a small curb, onto the dirt and bushes in front of the parking space. I stopped the car before it hit a fence behind the bushes. The impact bent my license plate but no other damage to the car was noted even though the front end of the car was more than halfway in the bushes. There were skid marks noted on the parking lot pavement from my car . I had held the steering wheel so tight that I tweaked my right wrist which is now sore. Had there been a solid wall facing us we could have been killed. I called SF Toyota to explain what had happened and to ask if they knew anything about the unexpected engine acceleration and brake failure. Their response was vague and they really didn't know. They did not ask that I bring the vehicle in for inspection; nor did they state that I should not drive it. After lunch, with much hesitation, I drove my friend and I back to [XXX]. The car was not driven again until the next morni