This brake system is designed with the S4 4-piston caliper, perfectly paired with a sturdy 12-inch, one-piece slotted and drilled zinc-plated rotor. You’ll appreciate the D.O.T compliant dust and weather seals that the S4 caliper boasts, along with its compatibility with the popular DR1 or HB100 pad types. What’s really neat is Baer's innovative backing plate, which not only serves as a caliper mount but also cleverly houses a modern one-piece park brake shoe assembly. Plus, you’ll find stainless braided hoses included for added durability. The 12-inch SS4 is a great fit for most wheels that are 16 inches or larger. It’s specifically designed for the 1979-92 Ford Mustang with the OE Ford 8.8” C-clip rear end (4 lug).