Why are the brakes locking up on my Ford Focus why are the brakes locking up on my Ford Focus?

My friend is having the same problem with her 2011 Focus. They told her it was to do with the traction control kicking in. She said it occurred out of the blue and wasn't under extreme conditions or bad driving. Ford replicated the locking and traction control activation during a test, but they said it wasn't a steering or break issue.