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Repairing the Bottom of a Bifold Door They are a great way to save space, but they can be a pain when they start to slide and scrape the floor. These problems can be easily solved with a few simple changes. If your bifold doors scrape on the floor, it is likely due to a broken track or worn roller. The damaged rollers need to be replaced. Bottom pivot Over time, a bifolding door's bottom pivot can loosen or even be able to fall off. This is usually caused by cracks or breaks in the wood piece on which the an