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Repairing the Bottom of a Bifold Door They are a great way to reduce space, but they can be a pain when they begin to sag and scrape the floor. The good news is that these problems are often easy to fix with a few simple adjustments. If your bifold door is rubbing against the floor, it's most likely due to a broken track or roller that is worn out. The damaged rollers should be replaced. Bottom pivot In time, a bifolding door's bottom pivot may loosen or even fall off. This can be caused by a damaged or c