General Motors Co., which has set a record for recalls this year as it tries to clear up lingering safety issues, is making an exception for rusting brake lines in almost 1.8 million pickups and sport-utility vehicles, Bloomberg News reported yesterday. Much like it did initially with flawed ignition switches in small cars linked to at least 13 deaths, GM says that the corroded lines aren’t a safety hazard that requires a recall. Even with at least 26 crashes, three injuries and a four-year-old probe by the National Highway Traffic Safety Administration, GM is characterizing potential brake failure as normal wear-and-tear.