Seized Brake Lines

[Lewis's Friend]

Hi All

I'm currently doing a brake refresh on a B12 Subaru Legacy GTB. I want to put new brake lines on to replace the rubber flexi pipes, but the unions to the hard lines are seized absolutely solid.

What is the best way of getting these undone? The union nut is 10mm, but is going to round off quickly using an open spanner. I have soaked everything with plusgas etc but it is way too tight.

I don't mind destroying the flexi pipes, but need to keep the hard lines (which carry the 10mm nuts) in one piece.

Any advice would be great...

[Lewis's Friend]

Thanks for the feedback - sadly, I think you've confirmed what I thought...!