This system showcases the S4 4-piston caliper, perfectly paired with a 12-inch, one-piece slotted and drilled, zinc-plated rotor. The S4 caliper is equipped with D.O.T compliant dust and weather seals, and it utilizes the widely popular DR1 or HB100 pad type. What sets Baer's design apart is its innovative backing plate, which not only serves as a sturdy caliper mount but also incorporates a modern one-piece park brake shoe assembly. You'll also find stainless braided hoses included in the package. The 12-inch SS4 is compatible with most wheels that are 16 inches or larger and fits rear ends with Ford 9" early big bearing housing ends (5x5.00"BC).