{"product_id":"wilwood-caliper-forged-superlite-1-38in-pistons-81in-disc","title":"Wilwood Caliper-Forged Superlite 1.38in Pistons .81in Disc","description":"\u003ch4\u003eWilwood Forged Superlite FSLI Caliper with Symmetrical 1.38-Inch Pistons for Short Track and Road Race\u003c\/h4\u003e\n\u003cp\u003eThe Wilwood WIL120-11128 is a Forged Superlite FSLI single caliper with dual symmetrical 1.38-inch pistons and a 0.81-inch disc width capacity. The 1.38-inch bore is the largest symmetrical piston option in the FSLI series at this rotor width, generating the highest clamping force for applications requiring maximum braking power with an 0.81-inch rotor. The Forged Superlite series is the benchmark in short track, late model, modified, and open wheel competition and has widespread use in road race, off-road, rally, and performance street applications. The FSLI design routes brake fluid internally between the two piston bores, eliminating the external crossover tube and replacing it with two bleed screw assemblies. This allows the WIL120-11128 to be mounted in any leading or trailing, left or right position on the axle without fluid routing changes. Sold as a single caliper.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSymmetrical 1.38-inch pistons for the highest clamping force in the FSLI 0.81-inch series\u003c\/li\u003e\n\u003cli\u003eInternal fluid ports eliminate the external crossover tube for improved durability\u003c\/li\u003e\n\u003cli\u003eTwo bleed screw assemblies allow leading or trailing, left or right mounting without rerouting lines\u003c\/li\u003e\n\u003cli\u003eFits 0.81-inch wide rotors\u003c\/li\u003e\n\u003cli\u003eForged billet aluminum body for maximum strength-to-weight ratio\u003c\/li\u003e\n\u003cli\u003eSuitable for short track, late model, open wheel, road race, rally, and street performance\u003c\/li\u003e\n\u003cli\u003eSold as a single caliper\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e120-11128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eWIL120-11128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiston Bore\u003c\/td\u003e\n\u003ctd\u003e1.38 in (symmetrical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRotor Width Capacity\u003c\/td\u003e\n\u003ctd\u003e0.81 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFluid Port Design\u003c\/td\u003e\n\u003ctd\u003eInternal (FSLI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMount Orientation\u003c\/td\u003e\n\u003ctd\u003eLeft or Right, Leading or Trailing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBleed Screws\u003c\/td\u003e\n\u003ctd\u003e2 (replaces crossover tube)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCaliper Material\u003c\/td\u003e\n\u003ctd\u003eForged Billet Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e1 caliper (order 2 for axle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Wilwood WIL120-11128 Forged Superlite FSLI caliper\u003c\/li\u003e\n\u003cli\u003eBleed screws installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wilwood-caliper-forged-superlite-1-12in-pistons-81in-disc\" title=\"Wilwood 120-11125 Forged Superlite Caliper 1.12in Pistons\"\u003eWilwood 120-11125 — Forged Superlite FSLI 1.12in Pistons, 0.81in Disc\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wilwood-caliper-forged-superlite-1-25in-pistons-0-81in-disc\" title=\"Wilwood 120-11126 Forged Superlite Caliper 1.25in Pistons\"\u003eWilwood 120-11126 — Forged Superlite FSLI 1.25in Pistons, 0.81in Disc\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wilwood-wil220-7496-bleed-screw-1-4-28-black\" title=\"Wilwood 220-7496 Bleed Screw 1\/4-28 Black\"\u003eWilwood WIL220-7496 — 1\/4-28 Black Bleed Screw (replacement for this caliper)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eAbout Wilwood\u003c\/h4\u003e\n\u003cp\u003eWilwood Engineering has been designing and manufacturing high-performance brake components in Camarillo, California since 1977. Every Wilwood caliper is machined from premium forged billet aluminum and validated through motorsports testing. Wilwood products are trusted by professional teams across SCCA, NASA, and multiple short track and oval disciplines worldwide.\u003c\/p\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the Wilwood WIL120-11128?\u003c\/strong\u003e\n\u003cp\u003eThe Wilwood WIL120-11128 is a Forged Superlite FSLI single caliper with dual symmetrical 1.38-inch pistons and 0.81-inch rotor width capacity. It provides the highest clamping force of the three symmetrical FSLI models at 0.81-inch rotor width, with internal fluid ports and dual bleed screw positions for flexible mounting.\u003c\/p\u003e\n\n\u003cstrong\u003eHow does the 1.38-inch piston compare to the smaller FSLI options?\u003c\/strong\u003e\n\u003cp\u003eA larger piston bore generates proportionally more clamping force at the same hydraulic line pressure. The 1.38-inch WIL120-11128 produces more clamping force than either the 1.12-inch WIL120-11125 or the 1.25-inch WIL120-11126 at the same 0.81-inch rotor width. Use the larger bore on the axle that requires more braking bias, such as the front axle in a front-heavy application.\u003c\/p\u003e\n\n\u003cstrong\u003eCan this caliper be mounted in a trailing position?\u003c\/strong\u003e\n\u003cp\u003eYes. The dual bleed screw design allows the WIL120-11128 to be mounted in a leading or trailing position on either the left or right side of the axle without changing fluid line routing.\u003c\/p\u003e\n\n\u003cstrong\u003eIs this caliper sold as a pair?\u003c\/strong\u003e\n\u003cp\u003eNo. The WIL120-11128 is sold as a single caliper. Order two for a complete front or rear axle setup.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat rotor width is required?\u003c\/strong\u003e\n\u003cp\u003eThe WIL120-11128 accepts 0.81-inch wide rotors. This is the same rotor width as the 1.12-inch and 1.25-inch FSLI variants, so rotor selection is consistent across the three symmetrical bore models at this width.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat thread size are the bleed screws on this caliper?\u003c\/strong\u003e\n\u003cp\u003eWilwood Superlite FSLI calipers use 1\/4-28 threaded bleed ports. The correct replacement bleed screw is the Wilwood WIL220-7496, available separately on our site.\u003c\/p\u003e\n\n\u003cstrong\u003eIs there an asymmetric version of this caliper for larger rotor widths?\u003c\/strong\u003e\n\u003cp\u003eYes. Wilwood makes additional Superlite variants with mixed piston bore sizes and wider rotor width capacity for applications requiring different pad contact areas or thicker rotors. Contact Wilwood or consult their full product catalog for the correct model if your application uses a rotor wider than 0.81 inches.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat pad compounds work with this caliper?\u003c\/strong\u003e\n\u003cp\u003eThe Wilwood Forged Superlite accepts Wilwood BP-10, BP-20, and BP-30 series pads as well as many third-party compounds in the correct tab pattern and width. Choose the compound based on your operating temperature range, rotor material, and use case from street to endurance racing.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eConfirm rotor width (0.81 in) and determine the required bracket offset for your application.\u003c\/li\u003e\n\u003cli\u003eMount the caliper bracket to the upright or knuckle and torque to specification.\u003c\/li\u003e\n\u003cli\u003eInstall brake pads into the caliper and position the caliper over the rotor on the bracket.\u003c\/li\u003e\n\u003cli\u003eTorque caliper mounting bolts to bracket specification and verify even pad-to-rotor clearance.\u003c\/li\u003e\n\u003cli\u003eConnect the brake line to the inlet port using a new copper sealing washer. Torque to specification.\u003c\/li\u003e\n\u003cli\u003eBleed from the outboard bleed screw and verify a firm, consistent pedal before driving.\u003c\/li\u003e\n\u003cli\u003eComplete a proper pad bed-in procedure before sustained hard braking use.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Wilwood","offers":[{"title":"Default Title","offer_id":39921326063695,"sku":"WIL120-11128","price":245.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/WIL120-11128-Wilwood-Wilwood-Caliper-Forged-Superlite-1_38in-Pistons-_81in-Disc-Brake-Calipers-Perf.jpg?v=1714610186","url":"https:\/\/www.blackopsautoworks.com\/products\/wilwood-caliper-forged-superlite-1-38in-pistons-81in-disc","provider":"Black Ops Auto Works","version":"1.0","type":"link"}