Wilwood ST FSL4R Caliper 1.25 .81 Rotor AnoFSL4R ST calipers provide performance advantages of Thermlock pistons for ultimate heat protection. Thermlock pistons used in the ST models block heat transfer from the pads and reduce temperatures in the caliper, fluid, and seals by up to 25% over standard stainless steel pistons. Featuring Type III Anodize finish, these are the go to calipers for all types sustained hard braking on dirt and asphalt ovals and a wide range of off road, rally and road
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