DTC C1020: Brake System Fill Not Complete: Action
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is pre-set in a new ABS module and can only be cleared when the brake system has been successfully bled. CARRY OUT the Brake System Service Bleed. REFER to General Procedures in the Brake System General Information article.