{"product_id":"rear-brake-master-cylinder-13mm-rab00463d-himalayan-450-guerrilla-450","title":"Royal Enfield Rear Brake Master Cylinder – 13 mm (OE) for Himalayan 450 \u0026 Guerrilla 450 — RAB00463\/D","description":"\u003cp data-start=\"386\" data-end=\"1006\"\u003eRestore crisp rear-brake feel on your Sherpa-450 platform bike with the \u003cstrong data-start=\"458\" data-end=\"540\"\u003egenuine Royal Enfield Rear Brake Master Cylinder — 13 mm (Part No. RAB00463\/D)\u003c\/strong\u003e. This factory unit matches the original bore size, porting, push-rod interface and electrical provision for the brake-light circuit, so it bolts straight onto the stock rear-set bracket and connects to the OE hose without adapters. Because it’s \u003cstrong data-start=\"786\" data-end=\"793\"\u003eOEM\u003c\/strong\u003e, piston seals and return spring rates are tuned for ABS modulation on the Himalayan\/Guerrilla 450, delivering progressive lever travel, consistent pressure and long service life in wet, dusty Indian conditions.\u003c\/p\u003e\n\u003cp data-start=\"1008\" data-end=\"1637\"\u003eFitment is \u003cstrong data-start=\"1019\" data-end=\"1032\"\u003econfirmed\u003c\/strong\u003e on the \u003cstrong data-start=\"1040\" data-end=\"1069\"\u003eHimalayan 450 (MY2024-on)\u003c\/strong\u003e and \u003cstrong data-start=\"1074\" data-end=\"1103\"\u003eGuerrilla 450 (MY2024-on)\u003c\/strong\u003e; both use the same Sherpa 450 braking architecture. Avoid universal “13 mm” pumps that can upset pedal ratio or leak at the banjo\/bleed points — this OE assembly maintains factory safety and feel, and helps reduce returns. If your rear brake feels spongy, sticks, or fails to build pressure after a fall, replacing the master cylinder and flushing fresh DOT 4 often restores performance. Verified by the Royal Enfield fiche\/dealer catalogs that list \u003cstrong data-start=\"1554\" data-end=\"1599\"\u003e“MASTER CYLINDER, REAR, 13 — RAB00463\/D.”\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-start=\"1639\" data-end=\"1654\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"1655\" data-end=\"2345\"\u003e\n\u003cli data-start=\"1655\" data-end=\"1777\"\u003e\n\u003cp data-start=\"1657\" data-end=\"1777\"\u003e\u003cstrong data-start=\"1657\" data-end=\"1682\"\u003eGenuine Royal Enfield\u003c\/strong\u003e assembly — \u003cstrong data-start=\"1694\" data-end=\"1737\"\u003eRAB00463\/D “MASTER CYLINDER, REAR, 13.”\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1778\" data-end=\"1887\"\u003e\n\u003cp data-start=\"1780\" data-end=\"1887\"\u003e\u003cstrong data-start=\"1780\" data-end=\"1794\"\u003e13 mm bore\u003c\/strong\u003e matched to Sherpa-450 ABS tune for predictable feel. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1888\" data-end=\"1992\"\u003e\n\u003cp data-start=\"1890\" data-end=\"1992\"\u003eDirect bolt-on to OE bracket and hose; \u003cstrong data-start=\"1929\" data-end=\"1944\"\u003eno adapters\u003c\/strong\u003e needed. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1993\" data-end=\"2057\"\u003e\n\u003cp data-start=\"1995\" data-end=\"2057\"\u003eOE seals\/spring rates for durability in heat, rain and dust.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2058\" data-end=\"2133\"\u003e\n\u003cp data-start=\"2060\" data-end=\"2133\"\u003eMaintains correct pedal ratio \u0026amp; stroke; avoids universal-part pitfalls.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2134\" data-end=\"2248\"\u003e\n\u003cp data-start=\"2136\" data-end=\"2248\"\u003eBacked by trusted dealer listings for \u003cstrong data-start=\"2174\" data-end=\"2207\"\u003eHimalayan 450 \u0026amp; Guerrilla 450\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2249\" data-end=\"2345\"\u003e\n\u003cp data-start=\"2251\" data-end=\"2345\"\u003eCompatible with OE ABS hardware and brake-light circuit. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2347\" data-end=\"2386\"\u003eCompatibility Table (confirmed only)\u003c\/h2\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2387\" data-end=\"2822\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2387\" data-end=\"2450\"\u003e\n\u003ctr data-start=\"2387\" data-end=\"2450\"\u003e\n\u003cth data-start=\"2387\" data-end=\"2395\" data-col-size=\"sm\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"2395\" data-end=\"2415\" data-col-size=\"sm\"\u003eEngine \/ Platform\u003c\/th\u003e\n\u003cth data-start=\"2415\" data-end=\"2432\" data-col-size=\"sm\"\u003eBS \/ Emissions\u003c\/th\u003e\n\u003cth data-start=\"2432\" data-end=\"2440\" data-col-size=\"sm\"\u003eYears\u003c\/th\u003e\n\u003cth data-start=\"2440\" data-end=\"2450\" data-col-size=\"md\"\u003eStatus\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2474\" data-end=\"2822\"\u003e\n\u003ctr data-start=\"2474\" data-end=\"2663\"\u003e\n\u003ctd data-start=\"2474\" data-end=\"2494\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2476\" data-end=\"2493\"\u003eHimalayan 450\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2494\" data-end=\"2521\" data-col-size=\"sm\"\u003eSherpa 450 (452 cc DOHC)\u003c\/td\u003e\n\u003ctd data-start=\"2521\" data-end=\"2542\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2523\" data-end=\"2541\"\u003eBS6.2 \/ Euro 5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2542\" data-end=\"2561\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2544\" data-end=\"2560\"\u003e2024–present\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2561\" data-end=\"2663\" data-col-size=\"md\"\u003e\n\u003cstrong data-start=\"2563\" data-end=\"2578\"\u003e✔ Confirmed\u003c\/strong\u003e: \u003cstrong data-start=\"2580\" data-end=\"2622\"\u003eRAB00463\/D – Master cylinder, rear, 13\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2664\" data-end=\"2822\"\u003e\n\u003ctd data-start=\"2664\" data-end=\"2684\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2666\" data-end=\"2683\"\u003eGuerrilla 450\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2684\" data-end=\"2697\" data-col-size=\"sm\"\u003eSherpa 450\u003c\/td\u003e\n\u003ctd data-start=\"2697\" data-end=\"2718\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2699\" data-end=\"2717\"\u003eBS6.2 \/ Euro 5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2718\" data-end=\"2737\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2720\" data-end=\"2736\"\u003e2024–present\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2737\" data-end=\"2822\" data-col-size=\"md\"\u003e\n\u003cstrong data-start=\"2739\" data-end=\"2754\"\u003e✔ Confirmed\u003c\/strong\u003e via dealer catalog mapping. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cblockquote data-start=\"2824\" data-end=\"3012\"\u003e\n\u003cp data-start=\"2826\" data-end=\"3012\"\u003e\u003cstrong data-start=\"2826\" data-end=\"2841\"\u003eExclusions:\u003c\/strong\u003e Not listed for Himalayan 411\/Scram 411 or any 350\/650 platforms in fiche for this PN. Order platform-specific parts for those bikes. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003ch2 data-start=\"3014\" data-end=\"3025\"\u003eVariants\u003c\/h2\u003e\n\u003cp data-start=\"3026\" data-end=\"3216\"\u003eSingle variant currently published: \u003cstrong data-start=\"3062\" data-end=\"3076\"\u003eRAB00463\/D\u003c\/strong\u003e (rear, 13 mm). \u003cem data-start=\"3092\" data-end=\"3178\"\u003e(Front master cylinder for Sherpa-450 is a different 14 mm assembly per fiche list.)\u003c\/em\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-start=\"3218\" data-end=\"3225\"\u003eFAQs\u003c\/h2\u003e\n\u003cp data-start=\"3226\" data-end=\"3380\"\u003e\u003cstrong data-start=\"3226\" data-end=\"3265\"\u003eQ1. Will this fit my Himalayan 450?\u003c\/strong\u003e\u003cbr data-start=\"3265\" data-end=\"3268\"\u003eYes — this is the \u003cstrong data-start=\"3286\" data-end=\"3321\"\u003eOE rear master cylinder (13 mm)\u003c\/strong\u003e for Himalayan 450. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3382\" data-end=\"3536\"\u003e\u003cstrong data-start=\"3382\" data-end=\"3425\"\u003eQ2. Does it also fit the Guerrilla 450?\u003c\/strong\u003e\u003cbr data-start=\"3425\" data-end=\"3428\"\u003eYes — dealer catalogs list \u003cstrong data-start=\"3455\" data-end=\"3469\"\u003eRAB00463\/D\u003c\/strong\u003e for Guerrilla 450 as well. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3538\" data-end=\"3677\"\u003e\u003cstrong data-start=\"3538\" data-end=\"3592\"\u003eQ3. What fluid should I use and how do I bleed it?\u003c\/strong\u003e\u003cbr data-start=\"3592\" data-end=\"3595\"\u003eUse DOT 4 as per the owner’s manual and bleed the rear circuit after installation.\u003c\/p\u003e\n\u003cp data-start=\"3679\" data-end=\"3875\"\u003e\u003cstrong data-start=\"3679\" data-end=\"3743\"\u003eQ4. My pedal feels soft after a tip-over — will this fix it?\u003c\/strong\u003e\u003cbr data-start=\"3743\" data-end=\"3746\"\u003eIf the master piston\/seals are damaged or contaminated, replacing with this OE unit plus a fluid flush usually restores pressure.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50511221784871,"sku":null,"price":1825.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/497E9731-7D13-4E1F-B743-0C11DD431C3C.jpg?v=1760876106","url":"https:\/\/underthehood.co.in\/products\/rear-brake-master-cylinder-13mm-rab00463d-himalayan-450-guerrilla-450","provider":"UNDER THE HOOD","version":"1.0","type":"link"}