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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space, but they can be a hassle when they begin to bow or scrape against the floor. These issues can be easily fixed by making a few small adjustments. If your bifold doors are scraping on the floor, it could be because of a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot In time the bottom pivot may loosen or even fall off. This is usually due to cracks or breaks in the wood piece that is where the pivot