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Bi Folding Door Repair Tips Bi-fold doors allow you to fully open up a space and connect indoors with outdoors. They are perfect to let the sun and fresh air in, but they must be properly maintained to prevent damage. There could be a myriad of issues with your bi-folding door. Luckily they're usually easy to fix! Cracked Pivot Pins You might have noticed that your bi-folding doors are scraping on the bottom, especially when you've added carpeting to your home or changed the flooring material.