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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space however, they can be a hassle if they start to sag or scrape against the floor. These issues can be easily fixed 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 solution is to replace the damaged rollers. Bottom pivot In time, a bifolding door's bottom pivot can become loose or even fall off