{"product_id":"bmw-m340i-m340d-g20-g21-sedan-and-touring-carbon-ceramic-brake-kits","title":"2019-2026+ BMW M340i \/ M340d (G20\/G21) Carbon Ceramic Brake Kit","description":"\u003cdiv class=\"sfx\"\u003e\n\u003csection class=\"box red\"\u003e\u003ch2\u003e2019-2026+ BMW M340i \/ M340d (G20\/G21) Carbon Ceramic Brake Kit — OEM-Size Replacement\u003c\/h2\u003e\n\u003cp\u003eThe G20\/G21 M340i and M340d use large OEM M Sport brake hardware, but repeated high-speed stops, heavy street use, and open-wheel brake dust can still make the factory iron setup the limiting part of the car. This StopFlex OEM-size carbon-ceramic kit replaces the listed 348mm or 374mm front rotors and 345mm rear rotors with carbon-ceramic discs, matched pads, hats, and floating hardware built around the original caliper positions. The payoff is higher heat stability, lower rotor mass at each corner, and far less visible dust while keeping the brake package tied to the exact BMW rotor size on the car.\u003c\/p\u003e\n\u003cul class=\"check\"\u003e\n\u003cli\u003e\u003cspan\u003eBuilt only for 2019-2026+ BMW M340i \/ M340d G20 sedan and G21 touring fitments using the listed 348mm or 374mm front rotor and 345mm rear rotor references.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWorks with the factory-style front fixed-caliper M Sport layout and rear 345mm brake package; ordering must match the car’s actual front rotor diameter.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCarbon-ceramic rotors reduce the dust and heat load that M340i and M340d owners notice during fast road driving, mountain descents, and repeated highway-speed braking.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e\u003csection class=\"box red\"\u003e\u003ch2\u003eFitment Hard Lines\u003c\/h2\u003e\n\u003cdiv class=\"scroll\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth class=\"accent\"\u003eField\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle\u003c\/td\u003e\n\u003ctd\u003eBMW M340i \/ M340d (G20\/G21)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel years\u003c\/td\u003e\n\u003ctd\u003e2019-2026+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront rotor reference\u003c\/td\u003e\n\u003ctd\u003eM340i\/M340d: 348mm, 374mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear rotor reference\u003c\/td\u003e\n\u003ctd\u003eM340i\/M340d: 345mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePage type\u003c\/td\u003e\n\u003ctd\u003eOEM-size carbon ceramic replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum wheel size\u003c\/td\u003e\n\u003ctd\u003e18\" (for the 340 mm rotor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"sf-emph\"\u003e\u003cp\u003eFor OEM replacement orders, StopFlex builds around the factory rotor specification shown for this vehicle. Front floating-caliper setups require manual review before production. If the car uses aftermarket calipers such as Brembo, AP Racing, Alcon, or Wilwood, the order can still be built, but the exact caliper model, pad shape, and rotor dimensions must be confirmed before production.\u003c\/p\u003e\u003c\/div\u003e\n\u003cp\u003eThis setup uses a 340 mm rotor, so the minimum wheel size is 18\". Wheels under 18\" will not clear the caliper and rotor, and spoke profile and offset affect clearance too — confirm your exact wheels before ordering.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"box\"\u003e\u003ch2\u003eWhy StopFlex CCB\u003c\/h2\u003e\n\u003cdiv class=\"grid g3\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eLower Unsprung Mass\u003c\/h3\u003e\n\u003cp\u003eStopFlex carbon-ceramic rotors are engineered to reduce rotor mass versus comparable iron discs, helping the suspension react cleaner and the steering feel more precise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eHigh-Temperature Stability\u003c\/h3\u003e\n\u003cp\u003eThe carbon-silicon-carbide matrix is built for stable braking behavior at temperatures that can push iron rotors into heavy fade.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eRust-Free Rotor Surface\u003c\/h3\u003e\n\u003cp\u003eCarbon ceramic does not form orange flash rust after rain, washing, or storage, keeping the visible rotor face cleaner behind open wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eLong Street-Service Potential\u003c\/h3\u003e\n\u003cp\u003eIn normal road use with matched pads and proper bedding, StopFlex CCB rotors are designed for far longer service life than typical iron replacement rotors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eLow Visible Dust\u003c\/h3\u003e\n\u003cp\u003eWhen paired with matched StopFlex pads, the system produces very low visible brake dust compared with conventional iron rotor and pad combinations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003ePremium Ceramic-Glaze Appearance\u003c\/h3\u003e\n\u003cp\u003eStopFlex's proprietary coating creates a bright, high-end ceramic-glaze finish with subtle glaze texture and a more premium visual character behind open wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eStreet-Usable Cold Bite\u003c\/h3\u003e\n\u003cp\u003eStreet Spec and Track-Day Spec rotors are designed for normal first-stop road use, including cold-weather operation. Motorsport Spec is the competition-focused exception.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eContinuous Fiber Reinforcement\u003c\/h3\u003e\n\u003cp\u003eLong-fiber carbon ceramic construction improves structural strength and thermal durability versus chopped-fiber approaches.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003ch3\u003eCustom Rotor Hat Color\u003c\/h3\u003e\n\u003cp\u003eEvery StopFlex OEM replacement order can be built with a custom rotor hat color, giving the carbon ceramic rotor package a cleaner match with the wheel, body color, and overall build style.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"box\"\u003e\u003ch2\u003eHeat Management Note\u003c\/h2\u003e\n\u003cp\u003eCarbon ceramic rotors tolerate extreme surface temperature, but they do not remove every heat-management requirement. During repeated hard stops, heat can still soak into pads, fluid, seals, calipers, wheels, and nearby components. For long track sessions, mountain descents, or sustained aggressive driving, brake cooling and high-temperature fluid are still recommended.\u003c\/p\u003e\u003c\/section\u003e\u003csection class=\"box\"\u003e\u003ch2\u003eStreet \/ Track-Day \/ Motorsport Rotor Options\u003c\/h2\u003e\n\u003cdiv class=\"grid g3\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/8933\/5811\/files\/StopFlex_Street_CCB_Rotor.jpg?v=1773907551\" alt=\"StopFlex Street Spec carbon ceramic brake rotor\"\u003e\u003ch3\u003eStreet Spec\u003c\/h3\u003e\n\u003cp\u003eCeramic coating, cross-drilled face, and large cooling channels.\u003c\/p\u003e\n\u003cp\u003eBest for daily driving and premium street builds that need clean cold bite, low dust, corrosion-free appearance, and long service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/8933\/5811\/files\/StopFlex_Trackday_CCB_Rotor.jpg?v=1773907551\" alt=\"StopFlex Track-Day Spec carbon ceramic brake rotor\"\u003e\u003ch3\u003eTrack-Day Spec\u003c\/h3\u003e\n\u003cp\u003eCeramic coating, blank face, and honeycomb cooling channels.\u003c\/p\u003e\n\u003cp\u003eBest for fast-road and track-day use where repeated braking stability matters more than maximum visual drilling style.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0761\/8933\/5811\/files\/StopFlex_Racing_CCB_Rotor.jpg?v=1773907551\" alt=\"StopFlex Motorsport Spec carbon ceramic brake rotor\"\u003e\u003ch3\u003eMotorsport Spec\u003c\/h3\u003e\n\u003cp\u003eUncoated blank face with honeycomb cooling channels.\u003c\/p\u003e\n\u003cp\u003eBest for race-focused builds that run competition pads, high-temperature fluid, cooling strategy, and a proper warm-up window. Not the default street choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"box\"\u003e\u003ch2\u003ePackage Scope\u003c\/h2\u003e\n\u003cdiv class=\"scroll\"\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth class=\"accent\"\u003eItem\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCB rotors\u003c\/td\u003e\n\u003ctd\u003eFull-car set by default\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCCB brake pads\u003c\/td\u003e\n\u003ctd\u003eMatched for StopFlex carbon ceramic rotors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7075 aluminum floating rotor hats\u003c\/td\u003e\n\u003ctd\u003eVehicle-specific fitment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStainless floating hardware\u003c\/td\u003e\n\u003ctd\u003eFull-car hardware set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRotor hat color\u003c\/td\u003e\n\u003ctd\u003eCustom rotor hat colors are available for every OEM replacement order.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrder scope\u003c\/td\u003e\n\u003ctd\u003eDefault listing is full-car set. Front-only or rear-only orders can be arranged after confirmation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"box\"\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this kit fit every 2019-2026+ M340i or M340d?\u003c\/summary\u003e\u003cdiv class=\"a\"\u003e\u003cp\u003eNo. This page is limited to G20\/G21 M340i and M340d cars with the exact OEM-size brake setup listed here: 348mm or 374mm front rotors and 345mm rear rotors. Confirm the front rotor diameter before ordering because BMW used more than one front brake size in this trim family.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes the rear electronic parking brake and Auto Hold still work?\u003c\/summary\u003e\u003cdiv class=\"a\"\u003e\u003cp\u003eYes, the kit keeps the rear brake architecture in the OEM position and is supplied as rotors, pads, hats, and floating hardware for the 345mm rear setup. The factory EPB motor, parking-brake function, and Auto Hold operation remain tied to the original rear caliper system.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhy change from the factory iron rotors on a G20\/G21 M340i or M340d?\u003c\/summary\u003e\u003cdiv class=\"a\"\u003e\u003cp\u003eThe factory iron rotors are heavy wear items that create dark dust and store heat during repeated braking. Carbon-ceramic rotors give this chassis better thermal stability, lower rotating and unsprung mass, and cleaner wheels while retaining OEM-size fitment.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat should I confirm before placing the order?\u003c\/summary\u003e\u003cdiv class=\"a\"\u003e\u003cp\u003eConfirm the vehicle is a G20 or G21 M340i\/M340d, measure or verify whether the front rotor is 348mm or 374mm, and check wheel barrel clearance against the brake package on the car. If the car has non-original wheels, spacers, or a prior brake conversion, verify fitment before ordering.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003c\/section\u003e\u003csection class=\"cta\" id=\"contact_form_page\"\u003e\u003ch2\u003eNeed Fitment Confirmation?\u003c\/h2\u003e\n\u003cp\u003eSend the exact vehicle details, current rotor sizes, and caliper type before ordering.\u003c\/p\u003e\n\u003cdiv class=\"cta-row\"\u003e\n\u003ca class=\"btn\" href=\"\/pages\/carbon-ceramic-brakes\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eCarbon Ceramic Brakes: Buying \u0026amp; Fitment Guide\u003c\/a\u003e\u003ca class=\"btn ghost\" href=\"#contact_form_page\"\u003eConfirm Fitment\u003c\/a\u003e\n\u003c\/div\u003e\u003c\/section\u003e\n\u003c\/div\u003e","brand":"StopFlex","offers":[{"title":"Default Title","offer_id":47895403626755,"sku":"100054","price":3000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0761\/8933\/5811\/files\/BMW-M340i-G20-CCB-Brake_41045026-ccf0-405c-8a3e-ed37c9ea80b4.jpg?v=1776240721","url":"https:\/\/stopflex-ccb.com\/products\/bmw-m340i-m340d-g20-g21-sedan-and-touring-carbon-ceramic-brake-kits","provider":"StopFlex","version":"1.0","type":"link"}