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Repairing the Bottom of a Bifold Door They are a great way to reduce space, but they can be frustrating when they begin to sag and scrape the floor. These problems can be easily solved by making a few minor adjustments. If your bifold door is scraping against the floor, it's most likely due to a broken roller or a worn track. The damaged rollers should be replaced. Bottom pivot Over time the pivot at the bottom of a bifold door could become loose or even fall out. This usually happens caused by cracks