I would be more worried about being sued and/or thrown in jail if you were to seriously maim or kill somebody. A brake running free down the hill can pick up serious speed and imagine that going off a jump and hitting somebody right in the face?
You would be completely fucked. Do the smart thing (which I did) and buy 4 backup brakes and just store them in your car. Now when one breaks you just take one from your stash to the ski shop and they'll fix it right there for you.
I don't know why anybody would ski park without backups in their car. They break way too easily.
My name is Nicky, but you can call me Dre.