The Wilwood 120-3842 is a two-piston Dynalite Single IIIA caliper built on the brand's permanent-mold cast aluminum platform, finished in Type III anodize for corrosion resistance. Wilwood positions this model as a stiff, light option within the Dynalite Single lineage. Its 1.75-inch stainless pistons give 2.40 square inches of total piston area and 1.1 cubic inches of pad volume, sized for rotors up to 0.25 inch wide and 13 inches in diameter.
Choose this caliper over a heavier, bulkier stock unit when a compact 3.75-inch lug-mount footprint is the priority, such as a narrow-rotor race or light-duty performance build. Its anodized aluminum body keeps unsprung weight low, and the two-piston layout pairs well with thin-profile rotors where packaging is tight. Because the rotor width ceiling is 0.25 inch, it is not a fit for thicker discs, so verify rotor dimensions before buying. Searches like "Wilwood 120-3842 two-piston lug caliper," "1.75 inch bore 0.25 rotor caliper," and "Type III anodized 3.75 centerline caliper" should lead to this exact part.
Before ordering, measure your bracket centerline and rotor thickness against the listed specifications. The manufacturer's install documentation could not be located during research, so confirm bracket, pad, fitting, and bleed-port details directly with Wilwood before installation.
