This system showcases the impressive S4 4-piston caliper, perfectly paired with a 12-inch, one-piece slotted and drilled zinc-plated rotor. The S4 caliper is designed with D.O.T compliant dust and weather seals, and it accommodates the widely-used DR1 or HB100 pad type. What’s really cool about Baer's design is the unique backing plate, which not only serves as a caliper mount but also cleverly houses a modern one-piece park brake shoe assembly. Plus, you’ll find stainless braided hoses included for added durability. The 12-inch SS4 is compatible with most wheels that are 16 inches or larger. This setup is a great fit for 1955-57 Chevy Full Size Passenger Cars with OE Bearing on Axle (BOA) Housing Ends.