leaking brake valve

Yes new lines but there leak issue is coming from the hard washer on the 11/16 nut and at the electric brake warning light plug non of the brake lines leak
I took my old valve and used the copper seal from it the new valves are from China and seals are bronze and are hard and will not seal .The valve from In Line Tubes was a piece of crap I got one from some one hear on for a bodies only and rebuilt it I had a slit leak at the light switch the light would glow finale it sealed is self