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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space, but they can be troublesome when they begin to bow or scrape against the floor. The good thing is that these issues are usually easy to fix by making a few minor adjustments. If your bifold doors scrape on the floor, this is most likely due to a damaged track or worn roller. The damaged rollers should be replaced. Bottom pivot In time the bottom pivot may loosen or even drop off. This is typically caused by cracks or breaks