Rear brake valve (91 200 20V Avant)

[Audi Quattro]

Had the metal brake line hose pop (rusted through) near the drivers side rear tire.
  One piece comes from a union, and the other goes into the rear (proportioning valve? # 443.614.151 E  (dont have ETKA handy) I cannot get the line unscrewed from this valve. Valve has only two connections, one on the pass side and one toward the drivers side. Its the end, thats on the passenger side that is rusted stuck. tried soaking in penetrating fluid, and still nothing. How can i remove this proportioning vavle so I can bench it and unscrew line? doesnt really look like it removes easily.
  any ideas?
   
  thanks!
  -Leszek
   

		
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