{"product_id":"wilwood-140-18155-d","title":"Wilwood Front GM Six-Lug 4x4 SRP Conversion (1971–1991) — Black Superlite, 12.88 x 1.25-Inch Rotors","description":"\u003cp\u003eBlack six-piston Superlite calipers pair with 12.88 x 1.25-inch SRP rotors in this GM 4x4 front conversion. The drilled-and-slotted configuration is documented consistently for this variant, with BP-10 pads supplied for the calipers. The manufacturer is Wilwood Engineering, founded by Bill Wood in 1977 and based in Camarillo, California. It designs and manufactures disc brake components and complete systems, from calipers and brake rotors to valves, master cylinders, fittings and brake lines. Motorsport, street-performance and specialized installations each require those components to be matched to the complete brake system.\u003c\/p\u003e\u003ch3\u003eTechnical Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eManufacturer part number: 140-18155-D\u003c\/li\u003e\n\u003cli\u003eRotor specification: Spec-37 Iron, SRP Drilled \u0026amp; Slotted, vented; 12.88 x 1.25 inches\u003c\/li\u003e\n\u003cli\u003eCaliper specification: 6-piston Forged Narrow Superlite 6R in Black Powder Coat; radial mount\u003c\/li\u003e\n\u003cli\u003eIncluded service pad compound: BP-10; Stainless pistons\u003c\/li\u003e\n\u003cli\u003eCaliper body material: Forged aluminum\u003c\/li\u003e\n\u003cli\u003eHydraulic inlet: 1\/8-27 NPT\u003c\/li\u003e\n\u003cli\u003eRotor\/hat wheel-stud clearance pattern(s): 6 x 5.5 in; 6 x 139.7 mm; match the installed hub\/axle pattern\u003c\/li\u003e\n\u003cli\u003eHydraulic brake hoses: not included; select the correct application-specific lines\/fittings\u003c\/li\u003e\n\u003cli\u003eWheel clearance: 17-inch wheels may fit; verify the manufacturer’s complete caliper\/rotor template for the installed wheel\u003c\/li\u003e\n\u003cli\u003eSupplied as one kit with mounting hardware; spindles, hubs, master cylinder and booster are not included\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\u003cp\u003eSelect this 12.88-inch Superlite conversion by the installed six-lug front hub and the exact GM 4x4 listing. The supported group spans specific 1971–1991 K-series pickups\/Suburbans, Blazer\/K5 Blazer and Jimmy versions, with no blanket coverage across the entire date range. Verify rotor and caliper clearance using the installation drawing.\u003c\/p\u003e\u003cp\u003eDS1671 requires hub stud-hole preparation. Hydraulic planning is also essential: Wilwood specifies a recommended 15\/16-inch master cylinder when retaining the factory pedal and vacuum booster, rather than the 1.12-inch OE bore that produces very high pedal effort. Where rear drums remain, follow the recommendation for a 10-pound residual valve plus a proportioning valve in their circuit. Hoses are not supplied.\u003c\/p\u003e\u003cp\u003eCheck the complete application table below, including its model-year splits and configuration notes.\u003c\/p\u003e\u003ch3\u003eManufacturer Resources\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.wilwood.com\/BrakeKits\/BrakeKitsProdFront?itemno=140-18155-D\"\u003eExact Wilwood kit specifications and wheel-clearance information\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.wilwood.com\/PDF\/DataSheets\/ds1671.pdf\"\u003eInstallation instructions and component list\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.\u003c\/p\u003e\u003cp\u003eAsk PMB Performance to help confirm the configuration before ordering if the vehicle has modified brakes or running gear. We have over 20 years of experience with parts and fitment; a VIN plus the installed component details gives us the best starting point.\u003c\/p\u003e\u003ch3\u003eVehicle Applications\u003c\/h3\u003e\u003cdiv class=\"fitment-table-wrap\" style=\"overflow-x:auto\"\u003e\u003ctable class=\"specs\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eModel option\u003c\/th\u003e\n\u003cth\u003eFront brakes\u003c\/th\u003e\n\u003cth\u003eRear brakes\u003c\/th\u003e\n\u003cth\u003eKit application\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1971-1974, 1987-1991\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eBlazer\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1971-1991\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eJimmy\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1971-1974\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK15\/K1500 Pickup\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1971-1974\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK15\/K1500 Suburban\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1975-1986\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eK10\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1975-1986\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eK10 Suburban\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1975-1986\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eK5 Blazer\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1975-1978\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK15\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1975-1978\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK15 Suburban\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1979-1986\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK1500\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1979\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK1500 Suburban\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1980-1986\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eK1500 Suburban\u003c\/td\u003e\n\u003ctd\u003e4 x 4\u003c\/td\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003ctd\u003eDrum\u003c\/td\u003e\n\u003ctd\u003eFront Kit\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch4\u003eApplication Notes\u003c\/h4\u003e\u003col\u003e\n\u003cli\u003eCaution: A 15\/16” bore master cylinder is recommended for proper brake function when installing this brake kit with the factory brake pedal and vacuum booster.\u003c\/li\u003e\n\u003cli\u003eWilwood offers a 15\/16” bore tandem master cylinder suitable for this application, p\/n 260-18184\u003c\/li\u003e\n\u003cli\u003eUsing the OE 1.12” bore master cylinder is not recommended and will require very high pedal effort to stop the vehicle.\u003c\/li\u003e\n\u003cli\u003eLine kit included (manufacturer): None\u003c\/li\u003e\n\u003cli\u003eFront line-kit reference: 220-18356\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Wilwood","offers":[{"title":"Default Title","offer_id":67724367495346,"sku":"140-18155-D","price":2425.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0521\/8792\/2610\/files\/140-18155-D_kit-xl.jpg?v=1792086312","url":"https:\/\/pmbperformance.com\/products\/wilwood-140-18155-d","provider":"PMB Performance","version":"1.0","type":"link"}