Mechanics and Fixing Any Questions Answered

Was just riding along™ and went down a hill, applied the brakes and heard a loud crack.

20" wheel on an urban arrow cargo bike (loaded with 40kg). Wasn't going at a crazy speed at all.

And was this the hubs maiden voyage? How old is it? I imagine it has been subjected to a lot of use and abuse in its life. If not could be a faulty part.

Have seen a couple Rohloff flange breaks on those bikes as well.