Attached photos show my near side rear caliper brake pipe connection. Hope they help.
I have never taken this joint apart on my car so I can’t comment on the type of sealing method. However I have a feeling that there shouldn’t be a washer present, especially if clamping against an uneven cast surface. Without the washer the hose union would normally seal at the bottom of the hole.
Check what the seal surface at the bottom of the hole looks like. From the hoses you have I would expect it to be a concave conical surface. However I have seen fittings where the bottom of the hole has a raised conical surface. That is normally designed to mate up with a double flared brake line, clamped in place with a pipe nut. Peter.
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