I do have that same problem when I do brakes or put a new part on. I just loosen it and retighten. They will seat and they need to be tight when you are SURE what is leaking. Hard to tell you how tight, but pretty tight. I just tighten them and test by pumping brakes. If they leak, I tighten a hair more and retest. Doing this slowly over several days does help sometimes. Time and day and night temperatures will "heal" it.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn