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Frost damage usually, blows the front of the brick off because it's porous and freezes. You can cut that brick out and patch a good brick in, it would be unusual for it to be covered in that kind of problem. I suppose it's not double brick though. Not picking at the intention, I'm sure you've weighed it up.
Airhead
Polygon
because the brick is deteriorated to the point where I think it's dangerous. That red patch on the right was where I pulled away a chuck of brick with my fingers.