This system showcases the impressive S4 4-piston caliper, perfectly paired with a 12-inch, one-piece slot-drilled, zinc-plated rotor. The S4 caliper is designed with D.O.T compliant dust and weather seals, ensuring durability in various conditions, and it accommodates the widely-used DR1 or HB100 pad types. What sets Baer's design apart is its innovative backing plate, which not only serves as a caliper mount but also cleverly incorporates a modern one-piece park brake shoe assembly. You’ll also find stainless braided hoses included for added reliability. The 12-inch SS4 is compatible with most wheels that are 16 inches or larger, making it a versatile choice for your ride. This system is designed to fit rear ends with GM Small Pattern 10/12 Bolt Bearing on Axle (BOA) and Non-Flush Mount Housing Ends (5x4.75", 5x5" BC).