At 46,000 miles the front right brake made a terrible sound, like that of a worn pad scraping the disk, which fortunately lasted only a few seconds. The car continued to brake normally, but 20 miles later the ABS, brake and exclamation sign lights came on. The ABS system stopped working. Afraid of the repair bill I continued driving the car for 8,000 additional miles. I finally took it to the dealer after several scaring brake locks in dry and wet pavement. The Prius with a faulty ABS system will lock the wheels much more readily that a car without ABS. Well, the cost of the repair was a surprising $63! The problem was pinpointed to a faulty electrical connection and was unrelated to anything regarding the brakes themselves.