{"product_id":"project-mu-forged-sports-caliper-fs4m-4pot-front-big-brake-kit-315x30mm-1-piece-rotors-for-toyota-86-gr86-zn6-zn8","title":"Project Mu Forged Sports Caliper FS4M 4POT Front Big Brake Kit (315x30mm 1-Piece Rotors) for  2013+ FRS\/BRZ\/86 2022+ BRZ\/GR86","description":"\u003cp style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0273\/1491\/files\/download_89a23d83-7a50-4507-9890-c1ec4e9d0b4d.png?v=1760034359\" alt=\"Project Mu Banner\" style=\"display: block; margin-left: auto; margin-right: auto; max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eOVERVIEW\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003eThe Project Mu FS4M Forged Street 4POT Front Caliper Kit delivers high-performance multi-piston braking capabilities at an accessible price point for the Toyota 86 and GR86 platform. Designed specifically for street performance and daily-driven track builds, the compact forged aluminum body provides excellent structural rigidity, reduced unsprung weight, and superior heat dissipation over stock single-piston floating calipers. Paired with 315x30mm 1-piece slotted rotors, this kit provides exceptional pedal response and thermal stability while maximizing clearance for popular 17-inch wheel setups.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\n\u003c!-- FRONT PRODUCT COMPARISON TABLE --\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left;\" border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"padding: 8px;\"\u003eCaliper Feature \/ Spec\u003c\/th\u003e\n\u003cth style=\"padding: 8px; background-color: #d9ead3;\"\u003e\u003cstrong\u003eFS4M Street (FS4M-F103SP)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS44 Slim (FS44S-F103)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS44 Full (FS44-F103A)\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"padding: 8px;\"\u003e\u003cstrong\u003eFS6 6POT (FS6-F103A)\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003ePrimary Purpose\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003eStreet \/ Light Track\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eFast Road \/ Track Day\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eFull Track \/ Time Attack\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eCompetition \/ Endurance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eCaliper Construction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003eForged Aluminum (Compact)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eForged Aluminum (Slim)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eForged Aluminum (Full-Size)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eForged Aluminum (6POT)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003ePiston Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e4 Pistons (38mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4 Pistons (38mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4 Pistons (41mm \/ 38mm)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e6 Pistons (38mm \/ 32mm \/ 28mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003ePads per Caliper\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e2 Pads\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4 Pads\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e4 Pads\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e2 Pads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eRotor Size \u0026amp; Style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003e315x30mm 1-Piece Slotted\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e332x28mm 2-Piece Floating\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e345x32mm 2-Piece Floating\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e345x32mm 2-Piece Floating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px;\"\u003e\u003cstrong\u003eWheel Clearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; background-color: #d9ead3;\"\u003eHigh (Fits many 17\" wheels)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003eModerate (17\"-18\" wheels)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e18\" Wheels required\u003c\/td\u003e\n\u003ctd style=\"padding: 8px;\"\u003e18\" Wheels required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eFEATURES\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eForged Aluminum Alloy Construction:\u003c\/strong\u003e Offers maximum structural rigidity and low deflection under aggressive thermal and physical loads while reducing unsprung mass.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eStreet-Focused Compact Profile:\u003c\/strong\u003e Engineered specifically to maintain tight clearances for 17-inch wheels without requiring extreme offset wheels or spacers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eWeather \u0026amp; Dust Seal Protection:\u003c\/strong\u003e Features internal fluid seals paired with dedicated outer wiper dust seals to protect pistons from road debris and moisture.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e1-Piece High-Carbon Slotted Rotors:\u003c\/strong\u003e Includes durable 315x30mm 1-piece rotors with 6 curved slits to continuously sweep pad faces clean and expel gases.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eIncludes NS-C Brake Pads:\u003c\/strong\u003e Comes standard with Project Mu NS-C street pads, providing low dust, quiet operation, and high initial bite for daily driving.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eWHAT IS INCLUDED\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e(2) Project Mu FS4M 4-Piston Forged Front Calipers (Teal Finish)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e(2) Project Mu 315x30mm 1-Piece Slotted Front Brake Rotors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e(1) Front Set of Project Mu NS-C Street Brake Pads\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e(2) Heavy-Duty Steel Caliper Mounting Brackets\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003e(2) Project Mu Teflon-Lined Stainless Steel Braided Brake Lines\u003c\/span\u003e\u003c\/li\u003e\n\u003cli role=\"presentation\" dir=\"ltr\"\u003e\u003cspan\u003eComplete Installation Hardware Set \u0026amp; Mounting Bolts\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003ePART NUMBERS\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e FS4M-F103SP\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eSPECIFICATIONS\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003ePosition:\u003c\/strong\u003e Front\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eCaliper Type:\u003c\/strong\u003e FS4M Forged Street 4-Piston Caliper\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003ePiston Diameter:\u003c\/strong\u003e 38mm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eCaliper Dimensions:\u003c\/strong\u003e 275.0mm (L) x 144.5mm (W) x 71.6mm (H)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eRotor Dimensions:\u003c\/strong\u003e 315mm Diameter x 30mm Thickness (1-Piece Construction)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eRotor Venting \/ Slits:\u003c\/strong\u003e Curved 6-Slit Pattern\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eStandard Included Compound:\u003c\/strong\u003e Project Mu NS-C (Optional TYPE PS \/ D1 Spec available upon request)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eFinish:\u003c\/strong\u003e Hard Alumite + Project Mu Teal Powder Coat\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eFITMENT\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e2013–2020 Toyota 86 \/ Scion FR-S \/ Subaru BRZ (ZN6 \/ ZC6 Chassis)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e2022+ Toyota GR86 \/ Subaru BRZ (ZN8 \/ ZD8 Chassis)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cem\u003eNote: Engineered for 17-inch wheel compatibility; always verify clearance using a Project Mu wheel fitment template before installation.\u003c\/em\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2 style=\"text-align: center;\" dir=\"ltr\"\u003e\u003cspan\u003eDISCLAIMER\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eBackplate Processing Required:\u003c\/strong\u003e Installation requires trimming or modifying OEM brake dust shields\/backplates.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eNon-Affiliation \u0026amp; Warranty:\u003c\/strong\u003e Direct parallel import of authentic JDM components. We are an independent retailer, not an authorized Project Mu dealer. Factory warranty applies in Japan only.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003e14-Day Defect Window:\u003c\/strong\u003e Customers must inspect all parts upon arrival. Defect, damage, or missing part claims must be reported within 14 days of delivery and prior to installation. Installed items are non-returnable.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli dir=\"ltr\"\u003e\u003cspan\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e Manuals are in Japanese. Professional installation by a certified technician is required.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Project Mu","offers":[{"title":"Default Title","offer_id":48574792007892,"sku":"FS4M-F103SP","price":2850.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0273\/1491\/files\/Project_Mu_Forged_Sports_Caliper_FS4M_4POT_Front_Big_Brake_Kit_315x30mm_1-Piece_Rotors_for_Toyota_86_GR86_ZN6_ZN8.jpg?v=1787937113","url":"https:\/\/shop.battlegarage-rs.com\/products\/project-mu-forged-sports-caliper-fs4m-4pot-front-big-brake-kit-315x30mm-1-piece-rotors-for-toyota-86-gr86-zn6-zn8","provider":"Battle Garage Racing Service","version":"1.0","type":"link"}