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So that's why Mustang production was halted... (link)
It seems Motor Trend snapped a clevis pin holding the brake pedal to the MC rod. MT freaked, Ford freaked, and Ford halted all production to search for any other cars with the condition (brake pedal arm not installed correctly). They couldn't find any, and MT surmises that the offending condition was caused after it left the factory, but still pretty scary.