Wilwood ST FSL6R Caliper 1.62/1.12/1.12 1.25

The Wilwood ST FSL6R caliper uses a unique combination of piston sizes – 1.62 inches for the leading edge and 1.12 inches for the trailing edge, with a 1.25-inch bore for the rear – to manage pad wear. This differential bore design is key for applications where sustained high temperatures can cause uneven pad wear. It helps compensate for the different mechanical loads and temperatures that occur across the brake pad surface during hard braking, leading to more consistent performance and longer pad life.

What really sets the ST models apart is the inclusion of Thermlock® pistons. These specially designed pistons act as a barrier, blocking heat transfer from the brake pads into the caliper body. In testing, they've shown they can reduce caliper temperatures, fluid temperatures, and seal temperatures by up to 25% compared to standard stainless steel pistons. This improved heat management is crucial for preventing brake fade during extended periods of hard braking, making these calipers a solid choice for demanding uses like dirt and asphalt oval racing, off-road adventures, rally stages, and road course driving.

Wilwood offers the ST FSL6R caliper in two durable finishes: a Quick-Silver Nickel finish or a Type III hard anodize. Both provide excellent corrosion resistance and a tough surface. When you're pushing your vehicle hard, especially on the track or off-road, managing heat is paramount. These calipers are built to handle that challenge, offering a significant advantage in sustained braking performance.