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Repairing the Bottom of a Bifold Door They are a great way to save space, but they can be frustrating when they begin to sag and scrape the floor. The good news is that these problems are usually easy to fix by making a few minor adjustments. If your bifold doors are scraping on the floor, this is most likely because of a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot In time the bottom pivot can loosen or even fall off. This is usually caused by