{"product_id":"royal-enfield-587523a-rear-brake-reservoir-himalayan-450-411","title":"Royal Enfield 587523\/A – Rear Brake Master Cylinder Reservoir Kit (Threaded) for Himalayan 411, Scram 411, Himalayan 450 \u0026 Guerrilla 450","description":"\u003cp data-start=\"246\" data-end=\"750\"\u003eThe \u003cstrong data-start=\"250\" data-end=\"276\"\u003eRoyal Enfield 587523\/A\u003c\/strong\u003e is the \u003cstrong data-start=\"284\" data-end=\"344\"\u003erear brake master cylinder reservoir kit (threaded type)\u003c\/strong\u003e—the small brake-fluid reservoir that screws into the rear master cylinder body to maintain fluid level and prevent air entry. If your rear brake feels \u003cstrong data-start=\"496\" data-end=\"506\"\u003espongy\u003c\/strong\u003e, you see \u003cstrong data-start=\"516\" data-end=\"533\"\u003efluid seepage\u003c\/strong\u003e, the reservoir is \u003cstrong data-start=\"552\" data-end=\"563\"\u003ecracked\u003c\/strong\u003e, or the \u003cstrong data-start=\"572\" data-end=\"597\"\u003ecap\/gasket area leaks\u003c\/strong\u003e, this is the correct OEM-style replacement—provided your master cylinder uses the \u003cstrong data-start=\"680\" data-end=\"709\"\u003ethreaded reservoir design\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"752\" data-end=\"789\"\u003e\u003cstrong data-start=\"752\" data-end=\"787\"\u003eAnswer-first \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"790\" data-end=\"1244\"\u003e\n\u003cli data-start=\"790\" data-end=\"919\"\u003e\n\u003cp data-start=\"792\" data-end=\"919\"\u003e\u003cstrong data-start=\"792\" data-end=\"807\"\u003eWhat it is:\u003c\/strong\u003e Rear brake master cylinder \u003cstrong data-start=\"835\" data-end=\"863\"\u003ereservoir kit (threaded)\u003c\/strong\u003e — \u003cstrong data-start=\"866\" data-end=\"878\"\u003e587523\/A\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"920\" data-end=\"1132\"\u003e\n\u003cp data-start=\"922\" data-end=\"1132\"\u003e\u003cstrong data-start=\"922\" data-end=\"944\"\u003eConfirmed fitment:\u003c\/strong\u003e Listed in Royal Enfield parts ecosystems for \u003cstrong data-start=\"990\" data-end=\"1011\"\u003eHimalayan 410\/411\u003c\/strong\u003e and shown under the rear brake master cylinder diagram for Himalayan 410 Euro 4. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1133\" data-end=\"1244\"\u003e\n\u003cp data-start=\"1135\" data-end=\"1244\"\u003e\u003cstrong data-start=\"1135\" data-end=\"1162\"\u003eVerify before purchase:\u003c\/strong\u003e \u003cstrong data-start=\"1163\" data-end=\"1213\"\u003eThreaded type + photo\/connector\/mounting match\u003c\/strong\u003e (do not guess on brake parts).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1246\" data-end=\"1401\"\u003eThis is a small, high-return-risk item if ordered wrong. Match your existing rear master cylinder reservoir style and confirm by \u003cstrong data-start=\"1375\" data-end=\"1386\"\u003eVIN\/EPC\u003c\/strong\u003e when in doubt.\u003c\/p\u003e\n\u003ch2 data-start=\"1403\" data-end=\"1435\"\u003eKey Features \u003c\/h2\u003e\n\u003cul data-start=\"1436\" data-end=\"2198\"\u003e\n\u003cli data-start=\"1436\" data-end=\"1557\"\u003e\n\u003cp data-start=\"1438\" data-end=\"1557\"\u003e\u003cstrong data-start=\"1438\" data-end=\"1463\"\u003eGenuine Royal Enfield\u003c\/strong\u003e part number \u003cstrong data-start=\"1476\" data-end=\"1488\"\u003e587523\/A\u003c\/strong\u003e (often referenced as 587523) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1558\" data-end=\"1655\"\u003e\n\u003cp data-start=\"1560\" data-end=\"1655\"\u003eItem description: \u003cstrong data-start=\"1578\" data-end=\"1615\"\u003eReservoir Kit – Rear M\/C Threaded\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1656\" data-end=\"1794\"\u003e\n\u003cp data-start=\"1658\" data-end=\"1794\"\u003eUsed in rear brake master cylinder assemblies that take a \u003cstrong data-start=\"1716\" data-end=\"1738\"\u003ethreaded reservoir\u003c\/strong\u003e (screw-in type) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1795\" data-end=\"1899\"\u003e\n\u003cp data-start=\"1797\" data-end=\"1899\"\u003eFixes common issues: cracked reservoir, seepage near cap\/gasket, contaminated or aged reservoir body\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1900\" data-end=\"2013\"\u003e\n\u003cp data-start=\"1902\" data-end=\"2013\"\u003eBest practice: replace\/bleed using correct \u003cstrong data-start=\"1945\" data-end=\"1964\"\u003eDOT brake fluid\u003c\/strong\u003e per your owner manual (fluid type not assumed)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2014\" data-end=\"2089\"\u003e\n\u003cp data-start=\"2016\" data-end=\"2089\"\u003eReturn-prevention ready: \u003cstrong data-start=\"2041\" data-end=\"2071\"\u003ematch photo + thread style\u003c\/strong\u003e before ordering\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2090\" data-end=\"2198\"\u003e\n\u003cp data-start=\"2092\" data-end=\"2198\"\u003eSmall OEM kit—ideal for restoring a leak-free rear brake system without replacing the full master cylinder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"2200\" data-end=\"2278\"\u003eCompatibility Table \u003c\/h2\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2280\" data-end=\"3114\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2280\" data-end=\"2327\"\u003e\n\u003ctr data-start=\"2280\" data-end=\"2327\"\u003e\n\u003cth data-start=\"2280\" data-end=\"2288\" data-col-size=\"md\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"2288\" data-end=\"2302\" data-col-size=\"sm\"\u003eEngine Type\u003c\/th\u003e\n\u003cth data-start=\"2302\" data-end=\"2313\" data-col-size=\"sm\"\u003eBS Stage\u003c\/th\u003e\n\u003cth data-start=\"2313\" data-end=\"2327\" data-col-size=\"md\"\u003eYear Range\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2346\" data-end=\"3114\"\u003e\n\u003ctr data-start=\"2346\" data-end=\"2508\"\u003e\n\u003ctd data-start=\"2346\" data-end=\"2381\" data-col-size=\"md\"\u003e\u003cstrong data-start=\"2348\" data-end=\"2380\"\u003eHimalayan 410 \/ 411 (Euro 4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2381\" data-end=\"2389\"\u003eLS410\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2389\" data-end=\"2398\"\u003eEuro 4\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-start=\"2398\" data-end=\"2508\"\u003eConfirmed on Himalayan 410 Euro 4 rear brake master cylinder diagram \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2509\" data-end=\"2660\"\u003e\n\u003ctd data-start=\"2509\" data-end=\"2558\" data-col-size=\"md\"\u003e\u003cstrong data-start=\"2511\" data-end=\"2557\"\u003eHimalayan (general listing across dealers)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2558\" data-end=\"2566\"\u003eLS410\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2566\" data-end=\"2570\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-start=\"2570\" data-end=\"2660\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2661\" data-end=\"2790\"\u003e\n\u003ctd data-start=\"2661\" data-end=\"2677\" data-col-size=\"md\"\u003e\u003cstrong data-start=\"2663\" data-end=\"2676\"\u003eScram 411\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2677\" data-end=\"2685\"\u003eLS410\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2685\" data-end=\"2689\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-start=\"2689\" data-end=\"2790\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2791\" data-end=\"2951\"\u003e\n\u003ctd data-start=\"2791\" data-end=\"2811\" data-col-size=\"md\"\u003e\u003cstrong data-start=\"2793\" data-end=\"2810\"\u003eHimalayan 450\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2811\" data-end=\"2824\"\u003eSherpa 450\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2824\" data-end=\"2828\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"md\" data-start=\"2828\" data-end=\"2951\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2952\" data-end=\"3114\"\u003e\n\u003ctd data-start=\"2952\" data-end=\"2972\" data-col-size=\"md\"\u003e\u003cstrong data-start=\"2954\" data-end=\"2971\"\u003eGuerrilla 450\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2972\" data-end=\"2985\" data-col-size=\"sm\"\u003eSherpa 450\u003c\/td\u003e\n\u003ctd data-start=\"2985\" data-end=\"2989\" data-col-size=\"sm\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd data-start=\"2989\" data-end=\"3114\" data-col-size=\"md\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2 data-start=\"3116\" data-end=\"3180\"\u003eVariants \u003c\/h2\u003e\n\u003cul data-start=\"3181\" data-end=\"3345\"\u003e\n\u003cli data-start=\"3181\" data-end=\"3270\"\u003e\n\u003cp data-start=\"3183\" data-end=\"3270\"\u003e\u003cstrong data-start=\"3183\" data-end=\"3214\"\u003eThreaded type reservoir kit\u003c\/strong\u003e: \u003cstrong data-start=\"3216\" data-end=\"3228\"\u003e587523\/A\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3271\" data-end=\"3345\"\u003e\n\u003cp data-start=\"3273\" data-end=\"3345\"\u003eNo LH\/RH variant for this reservoir kit (rear master cylinder component)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"3347\" data-end=\"3416\"\u003eVerified Fitment \u0026amp; Return-Prevention Gate\u003c\/h2\u003e\n\u003col data-start=\"3417\" data-end=\"3990\"\u003e\n\u003cli data-start=\"3417\" data-end=\"3540\"\u003e\n\u003cp data-start=\"3420\" data-end=\"3540\"\u003e\u003cstrong data-start=\"3420\" data-end=\"3453\"\u003eConfirm the exact identifier:\u003c\/strong\u003e 587523\/A (rear M\/C reservoir kit, threaded). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3541\" data-end=\"3700\"\u003e\n\u003cp data-start=\"3544\" data-end=\"3700\"\u003e\u003cstrong data-start=\"3544\" data-end=\"3563\"\u003eMatch the type:\u003c\/strong\u003e your rear master cylinder must accept a \u003cstrong data-start=\"3604\" data-end=\"3635\"\u003ethreaded\/screw-in reservoir\u003c\/strong\u003e (not a push-fit type). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3701\" data-end=\"3804\"\u003e\n\u003cp data-start=\"3704\" data-end=\"3804\"\u003e\u003cstrong data-start=\"3704\" data-end=\"3731\"\u003eMatch photo + mounting:\u003c\/strong\u003e reservoir body shape + cap\/gasket style must match your existing unit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3805\" data-end=\"3896\"\u003e\n\u003cp data-start=\"3808\" data-end=\"3896\"\u003e\u003cstrong data-start=\"3808\" data-end=\"3844\"\u003eBrake parts = high-risk returns:\u003c\/strong\u003e if unsure, \u003cstrong data-start=\"3856\" data-end=\"3877\"\u003everify by VIN\/EPC\u003c\/strong\u003e before ordering.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3897\" data-end=\"3990\"\u003e\n\u003cp data-start=\"3900\" data-end=\"3990\"\u003eIf your bike has a different master cylinder\/reservoir design, \u003cstrong data-start=\"3963\" data-end=\"3979\"\u003edo not order\u003c\/strong\u003e this part.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2 data-start=\"3992\" data-end=\"4050\"\u003eExclusions \/ Not Compatible \u003c\/h2\u003e\n\u003cul data-start=\"4051\" data-end=\"4371\"\u003e\n\u003cli data-start=\"4051\" data-end=\"4371\"\u003e\n\u003cp data-start=\"4053\" data-end=\"4371\"\u003e\u003cstrong data-start=\"4053\" data-end=\"4070\"\u003eDo not assume\u003c\/strong\u003e fitment for Classic\/Bullet\/Meteor\/Hunter\/650 Twins\/Thunderbird or other models unless your \u003cstrong data-start=\"4162\" data-end=\"4173\"\u003eVIN\/EPC\u003c\/strong\u003e confirms 587523\/A \u003cstrong data-start=\"4192\" data-end=\"4199\"\u003eand\u003c\/strong\u003e the reservoir is the threaded type. (Some sellers list “587523” broadly across platforms; ordering by assumption causes returns.) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-start=\"4373\" data-end=\"4421\"\u003eFAQs\u003c\/h2\u003e\n\u003col data-start=\"4423\" data-end=\"5744\"\u003e\n\u003cli data-start=\"4423\" data-end=\"4614\"\u003e\n\u003cp data-start=\"4426\" data-end=\"4614\"\u003e\u003cstrong data-start=\"4426\" data-end=\"4447\"\u003eWhat is 587523\/A?\u003c\/strong\u003e\u003cbr data-start=\"4447\" data-end=\"4450\"\u003eIt is the \u003cstrong data-start=\"4460\" data-end=\"4511\"\u003eReservoir Kit – Rear Master Cylinder (Threaded)\u003c\/strong\u003e for certain Royal Enfield rear brake master cylinder setups. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4616\" data-end=\"4832\"\u003e\n\u003cp data-start=\"4619\" data-end=\"4832\"\u003e\u003cstrong data-start=\"4619\" data-end=\"4669\"\u003eMy rear brake is soft\/spongy—will this fix it?\u003c\/strong\u003e\u003cbr data-start=\"4669\" data-end=\"4672\"\u003eIf the reservoir is cracked\/leaking and letting air in, replacing it can help, but you must also \u003cstrong data-start=\"4769\" data-end=\"4793\"\u003ebleed the rear brake\u003c\/strong\u003e properly. Verify the root cause first.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4834\" data-end=\"5032\"\u003e\n\u003cp data-start=\"4837\" data-end=\"5032\"\u003e\u003cstrong data-start=\"4837\" data-end=\"4884\"\u003eHow do I confirm “threaded” vs other types?\u003c\/strong\u003e\u003cbr data-start=\"4884\" data-end=\"4887\"\u003eThreaded type \u003cstrong data-start=\"4901\" data-end=\"4916\"\u003escrews into\u003c\/strong\u003e the master cylinder body. Match your existing part visually; if uncertain, verify by \u003cstrong data-start=\"5002\" data-end=\"5013\"\u003eVIN\/EPC\u003c\/strong\u003e and share a photo.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5034\" data-end=\"5269\"\u003e\n\u003cp data-start=\"5037\" data-end=\"5269\"\u003e\u003cstrong data-start=\"5037\" data-end=\"5086\"\u003eDoes 587523 (without \/A) mean the same thing?\u003c\/strong\u003e\u003cbr data-start=\"5086\" data-end=\"5089\"\u003eMany listings reference \u003cstrong data-start=\"5113\" data-end=\"5123\"\u003e587523\u003c\/strong\u003e as the base code and \u003cstrong data-start=\"5145\" data-end=\"5157\"\u003e587523\/A\u003c\/strong\u003e as the formatted part number. Confirm with VIN\/EPC to avoid mistakes. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5271\" data-end=\"5507\"\u003e\n\u003cp data-start=\"5274\" data-end=\"5507\"\u003e\u003cstrong data-start=\"5274\" data-end=\"5304\"\u003eIs this for Himalayan 411?\u003c\/strong\u003e\u003cbr data-start=\"5304\" data-end=\"5307\"\u003eIt is shown under the rear brake master cylinder diagram for \u003cstrong data-start=\"5368\" data-end=\"5392\"\u003eHimalayan 410 Euro 4\u003c\/strong\u003e. For other Himalayan\/Scram variants, verify by VIN\/EPC + threaded style. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5509\" data-end=\"5744\"\u003e\n\u003cp data-start=\"5512\" data-end=\"5744\"\u003e\u003cstrong data-start=\"5512\" data-end=\"5565\"\u003eCan I use this on Thunderbird \/ Classic \/ Bullet?\u003c\/strong\u003e\u003cbr data-start=\"5565\" data-end=\"5568\"\u003eDo not guess. Different platforms may use different rear master cylinder designs. Confirm by \u003cstrong data-start=\"5661\" data-end=\"5672\"\u003eVIN\/EPC\u003c\/strong\u003e and threaded-reservoir match.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50276251271463,"sku":null,"price":86.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/587523_RESERVOIR_KIT_REAR_MC_THREADED.png?v=1754284590","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-587523a-rear-brake-reservoir-himalayan-450-411","provider":"UNDER THE HOOD","version":"1.0","type":"link"}