Wilwood 120-17206-BK Radial Mount Disc Brake Caliper Black - XRS4R 4-Piston

The Wilwood 120-17206-BK XRS4R is a high-performance, radial mount four-piston disc brake caliper finished in a durable black powder coat. Engineered for serious street, track, and competition applications, the XRS4R caliper delivers exceptional clamping force, precise modulation, and a lightweight forged aluminum construction designed to stand up to extreme braking demands.

Key Features:

• Radial Mount Design: Provides superior rigidity and more precise caliper alignment compared to traditional lug-mount designs, resulting in improved brake feel and rotor wear
• Four-Piston Fixed Configuration: Delivers even, balanced clamping force across the brake pad for consistent and repeatable stopping performance
• Forged Aluminum Body: FEA-optimized construction maximizes strength-to-weight ratio while minimizing deflection under high braking loads
• Stainless Steel Pistons: Resists corrosion and reduces heat transfer from brake pads to caliper fluid, maintaining consistent pedal feel under sustained high-heat conditions
• High-Temperature Seals: Engineered to maintain performance integrity in demanding racing and performance driving environments
• Internal Fluid Passages: Eliminates the need for external brake lines between bores for a cleaner, more reliable installation
• Four-Corner Bleed Screws: Allows easy and thorough air evacuation and permits universal mounting in any corner position — front, rear, left, or right
• Black Powder Coat Finish: Provides long-lasting corrosion resistance and a clean, aggressive appearance

The Wilwood XRS4R caliper is a purpose-built performance braking component suited for high-performance street machines, road race builds, and track-day vehicles where radial mount brake systems are required. Wilwood's proven caliper engineering ensures a firm pedal and outstanding stopping power application after application.