As a bit of useless trivia, at one time the nuts on US Navy warship nuclear reactors were Cadmium plated. Admiral Rickover liked how it made them shine. Unfortunately, the radiation interacted with the Cadmium and steel of the nuts to embrittle it. Fortunately, this was discovered before any failed catostrophically in service and caused the reactor vessel head to come off!

Probably not a concern for Mercedes brakes, I admit.