Here"s a tip that might help,be sure fittings are clean,apply brake fluid to ends of fittings,
tighten snugly,loosen,re-tighten,loosen re-tighten about ten times,tighten good recheck
for leaks. If there is a slight mismatch of angles this will help to bring together.
Be sure to check closely the fitting ends,for cracks,pits or scaring,may need to use a magnifying glass to check.