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Repairing the Bottom of a Bifold Door They are a great way to save space, but can be a pain 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 rubbing against the floor, it's most likely due to a broken roller or a worn track. The solution is to replace the damaged rollers. Bottom pivot Over time the bottom pivot can loosen or even fall off. This is often due to a broken or cracked piece of wood where th