The TIS procedure uses ISTA Service Function to direct the process and cycle the appropriate DSC valves. It first drains the brake fluid tank. It notes the sequence of opening the two valves on each caliper.
BMW G12 M760Li xDrive Sedan / Repair Manuals and Technical Data / 34 Brakes / 34 00 Braking, check, ventilation / 34 00 027. Replacing fluid in brake system
BMW G12 M760Li xDrive Sedan / Repair Manuals and Technical Data / 34 Brakes / 34 00 Braking, check, ventilation / 34 00 027. Replacing fluid in brake system