This braking system is designed with the S4 4-piston caliper, paired with a robust 12-inch, one-piece slotted and drilled zinc-plated rotor. The S4 caliper comes equipped with D.O.T compliant dust and weather seals, 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 incorporates a modern one-piece park brake shoe assembly. You’ll also receive stainless braided hoses for added durability. The 12-inch SS4 is a great fit for most wheels that are 16 inches or larger. This setup is compatible with rear ends featuring Ford 9" early big bearing housing ends, with bolt patterns of 5x4.5" and 5x4.75"BC.