When replacing the front brake hoses on a 2000 S80 T6, Do I need to use PTFE, Pipe Dope or Loctite (threadlocker)? If so which side, brake line to brake hose and/or brake hose to caliper? Does any know the procedure (vadis or first hand experence)?

While replacing the front brake hoses, I have snapped the bolt (clean brake no damage to line or hose) of the drivers side brake line (brake hose to brake line) off, any ideas of how to remove and or fix? Can I buy another brake line bolt or do I need to replace the brake line?
Any ideas on how to fix?

Thanks,