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Repairing the Bottom of a Bifold Door They're a great method to save space, but they can be a hassle when they begin to lose their grip and scratch the floor. The good thing is that these issues are often easy to fix by making a few minor adjustments. If your bifold door is rubbing against the floor, it's probably due to a broken track or roller that is worn out. The damaged rollers must be replaced. Bottom pivot As time passes, a bifolding door's bottom pivot can become loose or even be able to fall off.