Good Morning Folks
     Been fighting weeping front brake lines where the hard line meets the flex hose for sometime.
Tried remaking the flared ends. (Imperial Eastman tool) Tried loosening and tightening repeatedly as recommended by someone. No luck.
Leaving the joints overnight I would wipe a finger around and get a wet smear of brake fluid.
     Then I found 45 deg. conical copper washers by Parker Hannifin  on Amazon. They seem to work. No weeps for 2 - 3 days.
stuey
UK

Got a picture of the part in question?

Lorena, Texas (South of Waco)

Hope this is what you want.
You don't get much for your money but they certainly worked for me.
Apparently they are brass, they look copper. 
https://www.amazon.com/Parker-2GF-3-pk10-Degree-Fitting-Gasket/dp/B075CNDXL7/ref=pd_sbs_328_2/135-0104782-8410304?_encoding=UTF8&pd_rd_i=B075CNDXL7&pd_rd_r=6a26031a-97a3-46ad-bbab-a3b07aecce9a&pd_rd_w=XOOlP&pd_rd_wg=KuC8P&pf_rd_p=d28ef93e-22cf-4527-b60a-90c984b5663d&pf_rd_r=2DM6K0EH81HXPCT03N77&psc=1&refRID=2DM6K0EH81HXPCT03N77 
stuey

That's interesting. I've struggled with double flaring brake lines in the past as well. Might be a good thing since I have 8 miles of brake lines to re make on my old truck sooner than later.

1956 F600 272
2005 F250 5.4

Have you tried these when under pressure?


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

I use an Eastwood double flare tool which I found makes perfect ends when I did my disc brake conversion. I was sure I tightened everything. I found 4 weepers when my wife held the pedal down. I continued to tighten them until they quit. I would have never thought it would take so much; I was sure some would strip out. I was very surprised how much a fitting and threading can take.

56 Vic, B'Ville 200 MPH Club Member, So Cal.