Wilwood – Forged Superlite Internal 4 Brake Caliper w/ Staggered Pistons

Wilwood – Forged Superlite Internal 4 Brake Caliper w/ Staggered Pistons (FSLI4)

The Wilwood Forged Superlite Internal 4 (FSLI4) brake caliper is engineered for sustained hard braking across dirt and asphalt ovals, as well as off-road, rally, and road course applications. Utilizing staggered (differential bore) stainless steel pistons, the FSLI4 compensates for leading-edge mechanical loading and temperature variation across the pad face to significantly reduce pad taper wear.

This latest-generation Superlite design features internal fluid ports, eliminating external crossover tubes and the potential damage associated with them. Dual bleed screw assemblies allow the caliper to be mounted in either leading or trailing positions.

At just ~4.4 lbs assembled, the FSLI4 delivers exceptional rigidity with minimal deflection thanks to stress-flow forged premium aluminum billet construction.

Features & Benefits

• Staggered stainless steel pistons – Increased clamping force with even pad wear
• Differential bore design – Reduces pad taper wear in high-heat conditions
• Forged Superlite construction – Exceptional strength with low weight
• Internal fluid ports – Eliminates external crossover tubes
• Dual bleed screws – Leading or trailing mounting orientation
• Closed-end bridge design – Reduced caliper deflection

Caliper Specifications

• Caliper Type: Forged Superlite Internal 4 (FSLI4)
• Pistons: Staggered / differential bore
• Piston Material: Stainless Steel
• Mounting Bolt Pattern: 3.50"
• Material: Stress-flow forged premium aluminum alloy
• Weight: Approx. 4.4 lbs assembled
• Applications: Dirt & asphalt ovals, off-road, rally, road course