Wilwood Caliper-Forged Superlite I4-ST 1.88/1.75in Pistons .81in Disc

If you're pushing your vehicle hard on the track, in off-road conditions, or on rally stages, managing brake heat and pad wear is critical. The Wilwood Forged Superlite I4-ST caliper is built to handle those demanding situations. It uses a combination of advanced piston technology to keep your brakes performing consistently when they get hot.

This caliper features differential bore pistons, meaning the pistons aren't all the same size. The larger piston is typically on the leading edge of the pad, and the smaller one on the trailing edge. This setup helps to even out the pressure across the brake pad, reducing uneven wear, or taper wear, especially under sustained high temperatures. On the ST models, like this one, Wilwood includes Thermlock® pistons. These special pistons are designed to block heat transfer from the brake pads, keeping the caliper body, brake fluid, and seals cooler by up to 25% compared to standard stainless steel pistons. This improved heat management means more consistent braking performance and longer component life under extreme use.

These calipers are a popular choice for serious competition vehicles where brake fade and component durability are major concerns. They offer a well-built solution for drivers who need reliable stopping power when it matters most.