I'm new to the forum so excuse my lack of propriety, but I've got a 2008 Prius and the brakes remain on for 2-3 seconds after touching the brake, then they ease off. It's not locking up, but definitely dragging. They don't pull to one side or another so I feel like it's a 4-wheel systemic issue. Is this a regenerative (computer) issue or what? Thanks all.
Did you ever solve your issue? My brakes drag for about four seconds after releasing the brake pedal. I believe the problem is related to the brake position sensor.