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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space however they can be a hassle if they start to sag or scrape against the floor. The good part is that these issues are usually fixable by making a few minor adjustments. If your bifold door is rubbing against the floor, it's probably due to a broken track or a worn roller. The solution is to replace the damaged rollers. Bottom pivot Over time, a bifolding door's bottom pivot can become loose or even fall off. This is usually caused