Brake Hose Question

[dlanders]

I had some flexible stainless steel brake hoses made at my local BrakeQuip dealer a few weeks ago. When I went to put them on over the weekend I noticed that I have a small leak where they bolt at the caliper. I just figured I needed some new washers so I picked up the only copper ones that I could find at the parts store. They didnt work so I picked up some brass ones at lowes that had a smaller hole. They dont leak as bad as the first ones but nonetheless they still leak. My next choice was gonna be some kind of nylon/plastic washer. The dude at Brakequip says the copper ones should work fine but I cant seem to get it to work. Has anyone had this problem or have an idea of something I could do?