1967-1973 Ford Mustang Rear SS4 Park Brake w/ Park Brake (4262350R)Description This rear system features the S4 4 piston caliper mounted to a 12 inch 1 piece slot, drill, zinc plated rotor. Baer systems include a unique billet backing plate that not only acts as a caliper mount, but also houses the bankisa 1 piece park shoe. This is a more modern, better working, park brake assembly than the more commonly used drum in hat park brake systems. Systems feature stainless steel brake hoses as well as calipers that have D.