This might be an old problem, I dont know. My vacuum boost thingy next to the fire wall, behind the brake cylinder, is leaking power steering fluid? What's the deal?????????
your power steering line connects to the booster(hydroboost) did you check to make sure the line was tight?...it also could be cold weather shrinking and expanding the fittings as well...did it just start with this recent cold weather we've been having?