I remember my right front brake boss on my Saracen Trekker giving a loud ping while decending down a hill near gee cross in tameside back in 1989 only for me to come eventually to a stop to find a hole in the front fork and the brake boss hanging on by a quarter of an inch but i still rode home and a couple of day's later i clamped and mig welded the brake boss so wasn't too bothered ..