Wilwood 120-17200 Radial Mount Brake Caliper Anodized - XRS4R 4-Piston

The Wilwood XRS4R Radial Mount Caliper (120-17200) is a high-performance, anodized aluminum 4-piston brake caliper engineered for demanding racing and performance street applications. Built using computer finite element analysis (FEA) and precision CNC machining, the XRS4R delivers exceptional rigidity and reduced weight without sacrificing clamping force.

Key Features:

• 4-Piston Fixed Caliper Design — delivers balanced, even clamping force across the brake pad for consistent, fade-resistant stopping power
• Anodized Aluminum Body — lightweight yet durable construction with a hard-anodized finish for corrosion resistance and long service life
• Radial Mount Configuration — simplifies installation and allows precise two-plane alignment over the rotor for optimal pad-to-rotor contact
• Thermlock Thermal Barrier Pistons — reduce heat transfer to brake fluid, protecting against vapor lock and brake fade under sustained high-heat conditions
• Type III Hard-Anodized Piston Bores — aluminum-oxide ceramic bore surface for enhanced durability and smooth piston operation
• Single-Point Bleed Technology — low-profile bleed screws allow for quick, easy brake system bleeding from a single location
• Staggered Bore Sizing — promotes more even pad engagement and extended, more uniform pad wear
• Wilwood Racing Logo — branded finish consistent with Wilwood's performance caliper lineup

The XRS4R caliper is sold individually and is designed to work with Wilwood's radial mount bracket systems and compatible rotors. Its race-proven architecture makes it a top choice for track builds, purpose-built race cars, and serious performance upgrades requiring a lightweight, zero-drag braking solution.