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?
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
The most successful companies are usually the ones that never rest. They are always striving to get better, to deliver more innovative products and get them to market faster. Onshape surveyed 850 product design and manufacturing pros to learn what techniques and strategies theyâ€™ve employed to keep ahead of their competition and in this white paper their answers are distilled. Download Now
Products come in all shapes and sizes, and customers demand solutions tailored to their needs. With mass customization software, these two facts can be reconciled in an automated, customer-facing experience called a product configurator. In this engineering.com research report, we examine the different levels of mass customization with the pyramid of product configurators. Taking a look at real-world case studies, we discover how the highest level of the pyramid can enable true engineering automation, saving time and increasing customer satisfaction. Download Now
We at engineering.com continually hear how engineers and designers will be doing simulation, such as FEA and CFD, and that they will be doing it early in the design cycle. Is this wishful thinking? We found out what it is really like in industry. Read more now. Download Now