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The Wilwood ST FSL4R caliper features differential bore pistons to reduce pad taper wear and, in ST models, Thermlock pistons that block heat transfer from the pads to lower caliper and fluid temperatures by up to 25% versus standard stainless pistons. Finished with a wear‑resistant Type III hard anodize, these calipers are specified for sustained hard braking on dirt and asphalt ovals and are widely used in off‑road, rally, and road course applications where thermal control matters.
Wilwood ST FSL4R Caliper 1.88/1.75 1.25 Rotor
