Wilwood 120-13265 Wilwood Caliper-Forged Superlite 4R-ST-R/H - 1.88/1.62in Pistons 1.25in DiscWilwood 120 13265 Wilwood Caliper Forged Superlite 4R ST R H 1. 88 1. 62in Pistons 1. 25in Disc FSL4R ST calipers provide the pad wear performance advantages of differential bore pistons with the option for ultimate heat protection using Thermlock pistons in the ST models. Differential piston bores compensate for leading edge mechanical loading and temperature variances across the pad face to reduce pad taper wear in sustained high temperature
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