How to Repair Bifold Door Top Roller Guide If your bifold doors are squeaking, they probably require a little attention. You may need to clean and lubricate them or adjust them. The problem could be caused by a loose bolt on the top pivot or by the top guide roller. https://bi-folding-door-repair04721.liberty-blog.com/30604978/ten-apps-to-help-control-your-bi-fold-door-repairs