Wilwood Caliper-Narrow Superlite 4R-ST - Anodized 1.25/1.25in Pistons 1.10in DiscFNSLR ST forged billet calipers, with four Thermlock pistons, deliver championship proven performance with piston sizes to provide matched rear braking bias for use with the Aero6 ST or other larger piston front calipers. FNSL4R ST calipers incorporate race technology into a radial mount body design with widespread adaptability. Including competition update options for all FNSL4R rear Big Brake kits. Thermlock pistons, high temp seals, SRS bridge
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