The GiroDisc rear caliper rebuild kit for 2014–2020 BMW M2, M3 and M4 (F8X) with 380mm blue calipers is a focused service kit for those specific rear calipers. It supplies the replacement items needed to restore sealing and caliper operation, giving technicians a direct-fit option to refresh the braking hardware on F8X models equipped with 380mm blue rear calipers.
GiroDisc 14-20 BMW M2/M3/M4 (F8X w/Blue Calipers) 380mm Rear Caliper Rebuild Kit