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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space however they can be a hassle when they begin to bow or scrape against the floor. These problems can be easily solved by making a few minor adjustments. If your bifold door is rubbing against the floor, it's most likely due to a broken roller or a worn track. The damaged rollers should be replaced. Bottom pivot In time the pivot at the bottom of a bifold door may become loose or even fall out. This is often due to a damaged