DAYTON, Ohio: Workers at two General Motors brake plants have gone on strike, threatening production at other GM plants. After failing to reach agreement during all night talks, about 3,000 workers walked out of the two plants Tuesday morning. The main issue in dispute is the production of parts by outside plants or companies. Union officials say GM's proposed 'outsourcing' of production could affect 125 jobs. Two years ago, workers at the two plants staged a three-day strike, shutting down five GM assembly plants. GM spokesman Tom Klipstine said that the strike would have no effect on any other GM operations, at least for now. "But I really cannot speculate on when or which assembly plants would be affected by this work stoppage," he said. Another bargaining session is scheduled for Wednesday.