Copper crush washer (3/8" or 10 mm ID) could not seal the brake line-to-caliper joint at the specified torque. Upon close examination, I found a pit on the caliper sealing surface. Of 6 or 7 concentric ridges, 3 outer ridges were compromised by corrosion. I raised the torque from 25 to 35 ft-lb and the joint seems to hold for now. I searched internet for alternate sealing materials (in the washer form): aluminum, Dowty seal (steel washer with rubber in the middle), and PTFE. I can make PTFE washer to the size with punches. I am sure PTFE will crush more than copper. Brake fluid stays below 200 C. So PTFE seems to be a good fit. What do the experts think? Or just replace the caliper?
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