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Repairing the Bottom of a Bifold Door They're a great method to reduce space, but they can be frustrating when they begin to sag and scrape the floor. These problems are easily fixable by making a few small adjustments. If your bifold doors are scraping on the floor, it could be due to a broken track or worn roller. The solution is to replace the damaged rollers. Bottom pivot Over time the bottom pivot can become loose or