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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space, but they can be a hassle when they begin to bow or scratch against the floor. The good news is that these problems are usually fixable with a few simple adjustments. If your bifold door is rubbing against the floor, it's likely due to a damaged track or roller that is worn out. The damaged rollers must be replaced. Bottom pivot In time the pivot pin at the bottom of a bifold door could become loose or even fall