This system showcases the impressive S4 4-piston caliper, perfectly paired with a 12-inch, one-piece slotted and drilled, zinc-plated rotor. The S4 caliper is designed with D.O.T compliant dust and weather seals, and it works seamlessly with the popular DR1 or HB100 pad types. What makes Baer's design stand out is its innovative backing plate, which not only serves as a caliper mount but also incorporates a modern one-piece park brake shoe assembly. Plus, you'll find stainless braided hoses included for added durability. The 12-inch SS4 is compatible with most wheels that are 16 inches or larger. This setup is specifically made to fit the 1979-92 Ford Mustang with the OE Ford 8.8" C-clip rear end (5 lug).