The Brembo GT rear big brake kit for Audi S5 (2008–2017) and S4 (2009–2016) combines a four‑piston rear caliper with a 380 x 28 mm two‑piece cast rotor in a slotted Type‑1 pattern and red finish. Offered for those S5 and S4 rear applications, the kit matches multi‑piston braking hardware to two‑piece rotors to help manage heat and provide consistent rear braking contact under load.
Brembo 08-17 S5/09-16 S4 Rear GT BBK 4 Piston Cast 380x28 2pc Rotor Slotted Type-1-Red