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Repairing the Bottom of a Bifold Door They're a great method to save space, but they can be frustrating when they start to slide and scrape the floor. These problems can be easily fixed with a few simple changes. If your bifold door is rubbing against the floor, it's most likely due to a broken track or roller that is worn out. damaged rollers need to be replaced. Bottom pivot In time the pivot at the bottom of a bifold door could become loose or even fall out. This is often due to a damaged or damaged wood