u/Financial-Bedroom421

2013 Nissan Frontier Pro-4x
Replacing calipers, rotors, and break pads. It’s been a long day and see this on the old break line. I can see the bolt through it— barely though. Should I replace it or is torquing the copper crush washers make for a good enough seal?

The nut connecting the flexible brake hose to the steel one is rusted through and my 10mm rotates freely so any advice on how to get through that is much appreciated if I end up needing to replace the line.