Wilwood 120-11782-P Forged Narrow Superlite Radial Mount Brake Caliper - FNSL4R 4-Piston Polished

The Wilwood Forged Narrow Superlite 4R (FNSL4R) radial mount brake caliper combines lightweight construction with extreme durability for high-performance braking applications. This polished caliper features radial mounting that simplifies installation and provides two planes of adjustment for precise alignment over the brake disc.

Advanced Forged Construction:

Starting at just 4.9 pounds, each FNSL4R caliper body is stress-flow forged from premium grade aluminum alloy billets. This advanced forging process re-aligns the metal's internal grain structure to flow within the contour of the caliper body, eliminating the stresses and interruptions that occur with traditional billet machining. The result is superior strength and durability that outperforms standard machined calipers.

Key Features:

• Stress-flow forged aluminum body for maximum strength-to-weight ratio
• Radial mounting design with dual-plane adjustment capability
• One-piece stainless steel pistons with slow heat transfer properties and high corrosion resistance
• Available in multiple piston bore sizes for front or rear applications
• SRS (Sliding Re-Tension Spring) bridge plates eliminate bridge wear and pad rattle
• Two-piece bleed screws on each end with internal fluid crossovers
• High-temperature square-faced bore seals for maximum sealing area and controlled piston retraction
• Compatible with full range of Wilwood brake pad compounds
• Polished finish for enhanced appearance

Performance Benefits:

The stainless steel pistons provide excellent heat resistance, while the optional Thermlock piston upgrade creates an additional thermal barrier to reduce heat transfer from pads to the caliper body, seals, and brake fluid. The SRS bridge plates not only extend caliper service life by preventing pad gouging, but also dampen harmonic vibrations that contribute to brake squeal. This caliper delivers big brake stopping power suitable for competition, track day, and aggressive street applications.