Re: JL8 caliper adapter fittings leaking
I don't know anything about JL8 brakes, but that looks like the male thread is pipe thread, and the female (can't see, but guessing) looks like it might be inverted flare. If I'm correct, use teflon thread sealing paste on the male threads of that fitting you show, and nothing on the flare fitting side of things. Just from the looks of the picture you posted, that doesn't look like it was intended to be used with a copper washer. And I could be totally wrong.
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