Brake lines, bump stops and dislocation depend on the length dampers and their mounts being used. If you stick to standard length items then none of theses should be a problem, unless you fit radically different springs that are either much shorter than standard or too long and coil bind.
Take note, not all spring and damper lift kits come with longer dampers.
If its just a small lift then personally I would question whether its worth fitting longer dampers. There is no one answer to suspension modifications, so make up your mind as to just what you want.