I have a 95 Disco. One of my brake lines going to the back developed a leak. I easily disconnected the connection to the back of the line in a few seconds. But the front connection that links the line to the line that goes into the engine department won't come loose. I've tried PB Blaster but I can't get the end to turn and let go.
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Try a flare nut wrench and wiggle it back and forth, tighten/loosen, etc.

 

I'll give it a shot. But I haven't even been able to get the slightest wiggle from this thing