This system is designed with the S4 4-piston caliper, paired with a sturdy 12-inch, one-piece slotted and drilled zinc-plated rotor. The S4 caliper comes equipped with D.O.T compliant dust and weather seals, ensuring durability in various conditions, and it's compatible with the widely used DR1 or HB100 pad types. What sets Baer apart is their innovative backing plate, which not only serves as a caliper mount but also integrates a modern one-piece park brake shoe assembly for added convenience. To top it off, stainless braided hoses are included for enhanced reliability. The 12" SS4 is a perfect fit for most 16-inch or larger wheels, making it a great choice for your ride. This setup fits 1967-73 Ford Mustang models with Ford 8"/9" Small Bearing Housing Ends.