The Brembo rear big brake kit for 2011–2016 528i applications includes four-piston billet calipers and two-piece 345×28 mm drilled rotors with a nickel finish. Delivered as a rear upgrade, it swaps standard rear hardware for billet calipers and drilled two-piece rotors designed to assist rotor cooling and venting, providing larger rear braking components for heavier or more demanding use.
Brembo 11-16 528i Rear GTR BBK 4 Piston Billet 345x28 2pc Rotor Drilled- Nickel