This system showcases the impressive S4 4-piston caliper, expertly paired with a 12-inch, one-piece slotted, drilled, and zinc-plated rotor. The S4 caliper is designed with D.O.T compliant dust and weather seals and accommodates the popular 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 integrates a modern one-piece park brake shoe assembly. Plus, we've included stainless braided hoses for added durability. The 12-inch SS4 is compatible with most 16-inch or larger wheels, making it a perfect fit for 1965-70 GM Full Size Passenger Cars with OE Large Pattern 10/12 Bolt C-Clip (BIH) Housing Ends.