I am replacing the front pads and rotors on my 300SD (because they are nearly worn out), so I planned to replace the flex lines too.

But, I discovered that the fittings on the hard lines are stuck in the flex lines badly enough that removing them will ruin the hard lines.

I did replace the drivers side one since the hard line is easy to change, and the other flex lines are currently fine. But, I don't really know what I will do if I have to ever replace the other flex lines, because it looks like the only way they will come out is to cut the hard line, and removing the hard lines to the passenger side or rear calipers looks like a huge job.
Is there an easy way to fix this? Or if I want a car I can keep a long time should I try to find a different 300SD that doesn't have this problem before any of the flex lines on mine actually need replacement. The car in the junkyard I took the one short hard line came apart with no problem, so I know they aren't all like this.