This system showcases the 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 popular DR1 or HB100 pad type. One of the standout features is Baer's innovative 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 16-inch or larger wheels, making it a great fit for 1970-74 GM F-Body Cars with OE Small Pattern 10/12 Bolt C-clip (BIH) housing ends.