Wilwood 120-17166 D31 Porsche Rear Dual Piston Disc Brake Caliper Gray Anodized

The Wilwood 120-17166 is a D31 series dual-piston rear disc brake caliper engineered as a high-performance replacement or upgrade caliper for Porsche rear brake applications. Built by Wilwood Engineering — a trusted name in performance braking — this caliper delivers reliable, consistent stopping power with a lightweight aluminum construction.

Key Specifications:

• Caliper Series: D31 (Dual Piston)
• Position: Rear
• Piston Diameter: 1.62 in.
• Rotor Width Compatibility: 0.94 in.
• Mounting Bracket Spacing: 3.00 in.
• Finish: Gray Anodized
• Piston Count: 2 (Dual Piston)
• Body Material: Aluminum

The D31 caliper features a rigid, single-piece aluminum body that reduces unsprung weight while maintaining structural integrity under high-heat braking conditions. The gray anodized finish provides corrosion resistance and a clean, professional appearance. The dual-piston design ensures even pad wear and consistent clamping force across the rotor surface.

This caliper is designed to accept Wilwood's standard D31-compatible brake pads and is ideal for track day builds, restoration projects, or performance upgrades on Porsche platforms requiring a rear caliper with a 3.00 in. lug mount and 0.94 in. rotor thickness.