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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 news is that these problems are usually fixable by making a few minor adjustments. If your bifold doors are scraping on the floor, it is most likely due to a broken track or worn roller. The damaged rollers must be replaced. Bottom pivot As time passes the pivot pin at the bottom of a bifold door can become loose or even fal