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Repairing the Bottom of a Bifold Door They're a great way to save space, but they can be frustrating when they start to slide and scrape the floor. These issues can be easily solved by making a few small adjustments. If your bifold door is scraping against the floor, it's likely due to a broken roller or a worn track. The damaged rollers must be replaced. Bottom pivot Over time, a bifolding door's bottom pivot can loosen or even be able to fall off. is typically due to cracks or breaks in the wood p