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Repairing Bifold Doors The hardware that is used to hold the bifold doors together will deteriorate over time. Cleaning and lubricating the mechanisms (including the lock) can keep them functioning efficiently and smoothly. Oft, the problem can be solved easily. This guide will teach you how to fix your bifold doors if they become difficult to open or close. Cracked Pivot Pins A bifold door is a pair of panels that slide down tracks that are located in the head side jambs, or floor.