Originally Posted by
Camilo
Still wondering if this could be a symptom of a mounting surface that isn't flat and square enough?
I had this issue on my bike. No matter what I tried, the caliper always shifted when tightened. I called several shops in my area. Only one shop even knew what I was talking about in regards to having the brake mounting surfaces faced, but didn't have the tools. My bike uses the old IS brake mount standard, and I was able to find the old Park brake mount facing tool that was only for IS mounts. I think I found it for around $75.00 After removing the brake adapters and facing the mounts, all was good and I have no problems centering my calipers. It even came in handy when I had the same problem on my Ice Cream Truck, which also uses IS mounts.