Wilwood 120-16683-RD Forged Narrow Superlite Radial Mount Brake Caliper - 4R Red

The Wilwood Forged Narrow Superlite 4R (FNSL4R) radial mount disc brake caliper represents the latest evolution in high-performance braking technology. Designed for extreme racing and performance applications, this caliper combines lightweight construction with exceptional stopping power and thermal management.

Advanced Forged Construction:

At just 4.9 pounds, the FNSL4R caliper body is stress-flow forged from premium grade aluminum alloy billets. This specialized forging process realigns the metal's internal grain structure to flow within the contour of the caliper body, eliminating internal stresses and creating a significantly stronger structure than traditional machined billet designs. The result is a caliper that delivers maximum strength with minimum weight.

Radial Mounting Design:

The radial mounting configuration simplifies installation and provides two planes of adjustment for precise alignment over the brake disc. This mounting style has become the standard in modern big brake systems for its superior rigidity and ease of setup.

Key Features:

• Stress-flow forged aluminum body for maximum strength-to-weight ratio
• One-piece stainless steel pistons with slow heat transfer properties and corrosion resistance
• SRS (Slide Retention System) bridge plates eliminate pad gouging and bridge wear
• Spring-loaded SRS plates prevent pad rattle and reduce squeal-inducing vibrations
• High-temperature square-faced bore seals provide maximum sealing area and controlled piston retraction
• Two-piece bleed screws on each end with internal fluid crossovers for protection against track debris
• Available in multiple piston bore sizes for front or rear applications
• Compatible with full range of Wilwood pad compounds
• Upgrade compatible with Wilwood Thermlock pistons for enhanced thermal barrier protection
• Attractive red anodized finish

The FNSL4R caliper is ideal for road racing, track day, and high-performance street applications where maximum braking performance and thermal management are critical. Compatible with Wilwood's complete range of brake pad compounds to match any driving style and heat requirements.