How to Repair Bifold Door Top Roller Guide If your bifold door is squeaking it's likely they need some attention. They might need to be cleaned and lubricated or adjusted. The issue could be caused by a loose bolt on the top pivot or by the top guide roller. This https://bifoldingdoorrepair26998.elbloglibre.com/30447127/bi-fold-door-repairs-s-history-history-of-bi-fold-door-repairs