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Repairing the Bottom of a Bifold Door They are a great way to reduce space, but they can be frustrating when they begin to lose their grip and scrape the floor. The good thing is that these issues are usually easy to fix by making a few minor adjustments. If your bifold door is scraping against the floor, it's probably due to a broken track or roller that is worn out. The damaged rollers should be replaced. Bottom pivot As time passes the pivot a