The Brembo Big Brake Kit for 2008–2013 135i rear applications provides a rear GTS BBK assembled with four‑piston cast calipers and 345x28 two‑piece rotors. This configuration includes slotted Type 1 rotors in a black finish and is specified for the 135i rear fitment, offered as a complete rear kit intended to upgrade the factory rear braking hardware for that model range.
Brembo 08-13 135i Rear GTS BBK 4 Piston Cast 345x28 2pc Rotor Slotted Type1-Black HA