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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space however they can be troublesome when they begin to slide or scrape against 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 likely due to a broken track or roller that is worn out. The solution is to replace the damaged rollers. Bottom pivot In time the pivot pin at the bottom of a bifold door