The Brembo rear big brake kit for 2015–2023 Ford Mustang (GT, V6, EcoBoost) fits the rear with a four‑piston caliper and cast two‑piece 380 x 28 mm rotors finished in yellow and featuring slotted Type1 faces. The description lists piston count, rotor size, two‑piece cast construction and rotor slot style, making the rear BBK specification explicit for these Mustang applications.
Brembo 15-23 Mustang GT/V6/EcoBoost Rear GT BBK 4 Piston Cast 380x28 2pc Rotor Slotted Type1-Yellow