Wilwood 120-17204 Radial Mount Brake Caliper Anodized - XRS4R 4-Piston

The Wilwood 120-17204 XRS4R Radial Mount Brake Caliper is a high-performance, competition-grade 4-piston caliper finished in a durable anodized coating. Engineered using finite element analysis (FEA) and precision CNC machining, the XRS4R delivers exceptional stiffness and braking consistency with a lightweight aluminum construction purpose-built for demanding race and performance applications.

Key Features:

• 4-Piston Radial Mount Design: Fixed, symmetrical 4-piston configuration provides consistent, even clamping force across the brake pad face
• Anodized Finish: Hard-anodized aluminum body provides corrosion resistance and long-lasting durability under high heat and demanding race conditions
• Thermlock Thermal Barrier Pistons: Reduces heat transfer from rotor and pad into the brake fluid, helping maintain consistent pedal feel and preventing fluid boil
• Hard-Anodized Piston Bores: Type III aluminum-oxide ceramic finish inside and on the surface for extended service life and reduced wear
• Single-Point Bleed Technology: Low-profile bleed screws allow for efficient, easy brake fluid bleeding and serviceability
• FEA-Optimized Body: Complex caliper body geometry removes unnecessary material to reduce weight while maintaining rigidity and improving brake fluid and heat cooling
• No-Bind Retaining Pins: Smooth, reliable pad retention compatible with a wide range of race compound brake pads
• Radial Mount: Direct radial mounting interface for precise caliper-to-rotor alignment and reduced flex

The Wilwood XRS4R is a proven choice for circle track, road racing, and high-performance street builds where precise, fade-resistant braking is essential. Sold individually.