Wilwood 120-17201-RD Forged Radial Mount Brake Caliper Red - XRS4R 4-Piston

The Wilwood 120-17201-RD is a forged aluminum XRS4R 4-piston radial mount brake caliper finished in a high-visibility red powdercoat. Engineered for high-performance street, track, and motorsport applications, the XRS4R series delivers exceptional stopping power with reduced unsprung weight compared to OEM cast-iron alternatives.

Key Features:

• Forged aluminum body — lightweight construction with superior strength-to-weight ratio
• 4-piston fixed caliper design — provides even, consistent pad clamping force across the rotor face
• Radial mount configuration — bolt-on installation to radial-drilled upright or bracket for precise alignment
• Red powdercoat finish — durable, heat-resistant coating with a bold appearance behind the wheel
• Compatible with Wilwood brake pads — accepts Wilwood's wide range of compound options for street, autocross, and road racing
• Precision-machined fluid ports and bleeder locations for efficient system bleeding
• High-temperature piston seals rated for aggressive braking cycles

Wilwood Engineering has been designing and manufacturing high-performance disc brake systems since 1977, producing calipers for applications ranging from competitive motorsport to military vehicles. The XRS4R caliper is a direct reflection of that experience, offering race-proven technology in a package suitable for performance street builds and dedicated track cars alike.