Originally Posted by
rmfnla
Rule of thumb is engagement should be at least as much as the diameter of the fastener. I don't think 4.5 threads will cut it (I wouldn't do it).
Put that brake back on the rear where it belongs.
I'm using my front brake on the rear so I can use the curved washers with the longer bolt. Brakes are the same here - only diff is the pivot bolt length.
Rear brake will be installed on the front. Pondering drilling out the front hole in the fork so I can insert this nut so it almost rests on the caliper when secure. Will install a few washers to take up the slack in the crown. About 10 threads will engage this way.