What causes the camber adjustment to go bad?

This depends entirly on what automobile we are talking about, EG:

THe GM P30 chassis from the 1980s was notorious for having the camber go out of tolerance backing off the alignment rack.

My race car it means I did not tighten the pinch bolts correctly.

Generally

  • Camber will be knocked out by impact, a curb or pot hole,
  • Any damage to the structure of the automobile.
  • Wear on bushings or joints that locate the wheel