OAKLAND — With the jury still hopelessly deadlocked on their 12th day of deliberations over the massive class action against Ford Motor Co., Alameda County Judge Michael Ballachey had no choice but to declare a mistrial Thursday and send the divided jurors home for good.

Thursday morning, Ballachey once again tried to rally the group to continue pushing toward a verdict, even asking them whether a few days of vacation might help them clear their heads enough to be able to resolve their differences. But when the jurors returned within five minutes from a roundtable vote on that proposal, it was clear the seven men and five women were ready to move on with their lives.