Wilwood 120-15989 Forged Narrow Superlite Disc Brake Caliper - 6R/ST

The Wilwood Forged Narrow Superlite 6R/ST (FNSL6R/ST) represents the latest evolution in high-performance brake caliper technology, engineered to deliver exceptional stopping power in extreme temperature environments across racing and high-performance applications.

Advanced Forged Construction:

Each caliper body is stress-flow forged from premium grade aluminum alloy billets, a manufacturing process that re-aligns the metal's internal grain structure to flow within the contour of the caliper body. This eliminates internal stresses and grain interruptions that occur with traditional billet machining, creating an exceptionally strong and durable caliper that weighs just 4.9 pounds. The design is optimized through computer-generated solid modeling and FEA stress analysis for maximum strength-to-weight ratio.

Thermlock Piston Technology:

Equipped with Wilwood's exclusive Thermlock insulated pistons, these calipers feature a multi-part piston design that creates a highly efficient thermal barrier. This advanced design significantly reduces heat transfer from the brake pads to the caliper body, seals, and brake fluid, resulting in cooler operating temperatures, extended component life, and reduced risk of heat-induced pedal fade.

Six-Piston Differential Bore Design:

The unique six-piston differential bore configuration provides balanced pad loading for even wear patterns, even during sustained high-heat braking conditions. This design ensures consistent brake performance and maximizes pad life.

Key Features:

• Stress-flow forged aluminum construction for maximum strength and durability
• Lightweight design at only 4.9 pounds
• Thermlock insulated pistons reduce heat transfer and prevent fade
• Six-piston differential bore configuration for balanced pad wear
• SRS bridge plates eliminate bridge wear from pad gouging and extend caliper life
• Spring-loaded SRS plates eliminate pad rattle and dampen vibrations that cause squeal
• Two-piece bleed screws on each end for easy bleeding and debris protection
• Internal fluid crossovers protect against track debris damage
• High-temperature square-faced bore seals maximize sealing area and control piston retraction
• Compatible with full range of Wilwood brake pad compounds

Designed for professional racing and extreme performance applications where reliability, heat management, and consistent brake feel are critical. The FNSL6R/ST caliper delivers professional-grade braking performance with the durability to withstand the most demanding conditions.