Wilwood 120-17201 Anodized Radial Mount Brake Caliper - XRS4R 4-Piston

The Wilwood 120-17201 XRS4R is a high-performance, anodized aluminum 4-piston radial mount brake caliper engineered for racing and high-demand braking applications. Built on decades of motorsport experience and refined through computer finite element analysis (FEA) and precision CNC machining, the XRS4R delivers exceptional stopping power while minimizing weight and rotor drag.

Key Features:

• Lightweight Aluminum Construction: Innovative caliper body geometry removes unnecessary bulk while improving stiffness and reducing deflection under heavy braking
• Hard-Anodized Finish: Type III aluminum-oxide ceramic hard-anodized finish inside and out for superior corrosion resistance and thermal durability
• 4-Piston Design: Four Thermlock thermal barrier pistons reduce heat transfer to brake fluid for consistent pedal feel and improved fade resistance
• Radial Mount: Radial mounting configuration simplifies installation and provides two planes of adjustment for precise rotor alignment
• Improved Brake Cooling: High-surface-area caliper body promotes airflow and brake fluid cooling without compromising structural rigidity
• Single-Point Bleed Technology: Low-profile bleed screws enable fast, efficient brake fluid bleeding and servicing
• No-Bind Retaining Pins: Secure pad retention with smooth release for zero-drag performance
• Anodized Piston Bores: Hard-anodized bore surfaces resist wear and extend service life

The Wilwood XRS4R caliper is sold individually and is designed for competitive motorsport, oval track, road racing, and performance street applications requiring a reliable, lightweight, high-clamping radial mount caliper solution.