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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers however they can be frustrating when they begin to slide or scrape against the floor. The good thing is that these issues are usually fixable by making a few minor adjustments. If your bifold doors are scratching on the floor, this is most likely due to a broken track or worn roller. The damaged rollers must be replaced. Bottom pivot As time passes, a bifolding door's bottom pivot can become loose or