Wilwood 120-17203 Anodized Radial Mount Brake Caliper - XRS4R 4-Piston

The Wilwood 120-17203 XRS4R is a high-performance, anodized aluminum 4-piston radial mount brake caliper engineered for demanding motorsport and performance applications. Built on Wilwood's proven XRS4R platform, this caliper combines decades of race-derived engineering with advanced manufacturing techniques to deliver superior stopping power, reduced weight, and exceptional rigidity.

Key Features:

• 4-Piston Design: Symmetrical, opposed-piston configuration delivers balanced clamping force and consistent brake feel across the full pad contact area
• Radial Mount Configuration: Bolt-on radial mounting provides a stiff, precise caliper-to-rotor relationship for improved braking performance and reduced flex
• Anodized Aluminum Body: Lightweight, forged or billet aluminum construction with a durable anodized finish for corrosion resistance and long service life
• Thermlock Thermal Barrier Pistons: Reduces heat transfer from the rotor and pads into the brake fluid, maintaining consistent pedal feel under extreme conditions
• Hard-Anodized Piston Bores: Type III aluminum-oxide ceramic finish on piston bores enhances wear resistance and sealing performance
• Single-Point Bleed Technology: Simplifies brake bleeding with low-profile bleed screws for fast, easy serviceability
• Innovative Caliper Body Geometry: Complex body shape reduces unnecessary mass while improving stiffness, brake cooling, and fluid cooling
• Wilwood Racing Logo: Branded finish consistent with Wilwood's premium performance caliper lineup

The Wilwood XRS4R radial mount caliper is designed for use in circle track, road racing, and high-performance street applications where consistent braking performance and thermal management are critical. Sold individually.