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Repairing the Bottom of a Bifold Door They are a great way to reduce space, but they can be frustrating when they start to slide and scrape the floor. These issues can be easily solved with a few simple changes. If your bifold doors are scratching on the floor, it is most likely due to a broken track or worn roller. The damaged rollers must be replaced. Bottom pivot In time, a bifolding door's bottom pivot may loosen or even be able to fall off. This can be due to