One problem related to brake light has been reported for the 2008 Toyota Prius. The most recently reported issues are listed below.
Was parked in line to pick up child from school. Turned car on and put it on drive, moved slowly when parking brake light, abs warning light, traction control light all came on and then my brakes went limp. Had to push all the way to the floor and stopping was still hard to do. Almost hit the car in front of me when suddenly all lights went off and brakes jerked to a sudden stop. I'm terrified to drive my car at faster speed knowing my brakes basically went out. Pretty sure it's failing brake actuator and Toyota knows about this probably but didn't do a recall only extended warranties. . . I didn't own the car when those warranties we're going on in 2016. Headlights also will randomly turn off and I have to turn them off and back on constantly driving at night.