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Originally Posted by Christien

I haven't done any of that, but I will. I know one of the calipers does stick from time to time, and I have the parts to rebuild it (it's on my list for this summer), but would that actually grip the brake disc enough to actually lock the tire up momentarily, and only during a downshift?

Though now that you mention it, I wonder if it was only happening in turns. I'm going to take it for a spin today and test that.

If its dragging the extra drag could overcome the tires grip.