Wilwood 120-11876 Forged Narrow Superlite Radial Mount Brake Caliper - 4R

The Wilwood Forged Narrow Superlite 4R (FNSL4R) represents the latest evolution in high-performance disc brake caliper technology. Featuring radial mounting for simplified installation and precise disc alignment, this caliper delivers exceptional stopping power across a wide range of motorsports and performance vehicle applications.

Advanced Forged Construction:

Starting at just 4.9 pounds, the FNSL4R caliper body is stress-flow forged from premium grade aluminum alloy billets. This manufacturing process realigns the metal's internal grain structure to flow within the contour of the caliper body, eliminating the internal stresses and grain interruptions that occur with standard billet machining. The result is superior strength and durability in a lightweight package, validated through computer-generated solid modeling and FEA stress analysis.

Key Features:

• Radial mounting design provides two planes of adjustment for accurate rotor alignment
• One-piece stainless steel pistons for slow heat transfer and excellent corrosion resistance
• Compatible with optional Thermlock pistons for enhanced thermal barrier protection
• SRS (Stainless Rotor Sleeve) bridge plates eliminate pad gouging and bridge wear
• Spring-loaded SRS plates prevent pad rattle and dampen vibrations that cause squeal
• Two-piece bleed screws on each end with internal fluid crossovers
• High-temperature square-faced bore seals maximize sealing area and control piston retraction
• Available in multiple piston bore sizes for front or rear applications

Performance Benefits:

The FNSL4R's advanced thermal management reduces heat transfer from brake pads to the caliper body, seals, and brake fluid. This results in cooler operating temperatures, extended component service life, and reduced risk of heat-induced brake fade. Compatible with the full range of Wilwood pad compounds to match specific heat ranges and brake response characteristics for competition or high-performance street driving.