This system showcases the impressive S4 4-piston caliper, perfectly paired with a 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 offers, along with compatibility with the popular DR1 or HB100 pad types. What sets Baer apart 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 receive stainless braided hoses for added durability. The 12-inch SS4 is designed to fit most wheels that are 16 inches or larger, making it a versatile choice for your vehicle. It fits rear ends with GM small pattern 10/12 bolt bearing on axle (BOA) with flush mount bearing housing ends (5x4.75", 5x5"BC).