Wilwood 120-16041 SX6R ST Forged 6-Piston Radial Mount Disc Brake Caliper Type III Ano Left 4.04in Piston 1.25in Disc

The Wilwood 120-16041 is a Type III hard-anodized, left-side forged six-piston radial mount disc brake caliper from the SX6R/ST series. Engineered for demanding road racing and high-performance braking applications, this caliper combines race-proven technology with broad adaptability, featuring a 4.04 sq. in. piston area and compatibility with rotors up to 15.00 inches in diameter on a 1.25-inch thick disc.

Key Features:

• Stress-Flow Forged Aluminum Body: The caliper body is forged from premium-grade aluminum alloy billet using a stress-flow forging process that realigns the metal's internal grain structure to follow the contour of the caliper body — eliminating the structural interruptions caused by conventional billet machining and delivering superior clamping efficiency with maximum resistance to fatigue, distortion, and stress under load.
• Thermlock® Piston Technology: SX6R/ST calipers utilize Wilwood's proprietary Thermlock® pistons for ultimate thermal insulation, significantly reducing heat transfer from the rotor and pad to the brake fluid — a critical advantage in sustained, high-heat road racing environments.
• Radial Mounting Design: The radial mount configuration maximizes caliper rigidity under braking loads for consistent, repeatable pedal feel and improved braking modulation.
• Six-Piston Configuration: Six pistons distribute clamping force evenly across the brake pad face for uniform pad wear and maximum braking efficiency.
• Type III Hard Anodized Finish: The Type III anodized surface treatment provides a durable, corrosion-resistant finish with superior hardness compared to standard anodizing — well-suited for the extreme conditions of road racing.
• Left-Side Orientation: Designed specifically for left-side (driver's side) installation.
• Versatile Rotor Compatibility: Supports rotor diameters up to 15.00 inches with a 1.25-inch disc thickness, accommodating a wide range of heavy-duty brake system configurations.

The Wilwood SX6R/ST series represents the pinnacle of Wilwood's radial mount caliper lineup, delivering race-level stopping power with the durability and adaptability needed for high-performance road racing builds. This caliper is sold individually.