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Often, I've had to tighten and loosen new fittings firmly several times to get a good seal on new lines. You should notice the threaded nut turning in more-and-more as the flare finally seats.

I also tap the master cylinder with a small hammer to help expel the smaller air bubbles while on the bench.

X2 And if you can compare the fittings in you master to a new. Its rare but the brass does wear down too much over the years.