{"product_id":"royal-enfield-594631-a-front-brake-master-cylinder-thunderbird-350-500","title":"Royal Enfield Front Brake Master Cylinder Assembly with Lever for Thunderbird 350 \u0026 Thunderbird 500 – 594631\/A","description":"\u003ch2\u003eRoyal Enfield Front Brake Master Cylinder Assembly with Lever for Thunderbird 350 \u0026amp; Thunderbird 500 – 594631\/A\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e594631\/A\u003c\/strong\u003e is a genuine Royal Enfield \u003cstrong\u003efront brake master cylinder assembly with lever\u003c\/strong\u003e. OEM-style Royal Enfield parts sources identify this exact part number as \u003cstrong\u003eMASTER CYLINDER ASSY FR. DISC - NT LEVER\u003c\/strong\u003e, while the older number \u003cstrong\u003e594631\u003c\/strong\u003e is shown as replaced by \u003cstrong\u003e594631\/A\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis is the correct OEM replacement when the original front brake master cylinder is leaking, seized, crash-damaged, internally worn, or supplied without a usable lever assembly. Buyers may also search for it as \u003cstrong\u003eThunderbird 350 front master cylinder\u003c\/strong\u003e, \u003cstrong\u003eThunderbird 500 brake master cylinder\u003c\/strong\u003e, \u003cstrong\u003efront brake pump Royal Enfield\u003c\/strong\u003e, \u003cstrong\u003ebrake lever master cylinder assembly\u003c\/strong\u003e, and \u003cstrong\u003eNTB front brake master cylinder\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe strongest fitment evidence points to the \u003cstrong\u003eThunderbird family\u003c\/strong\u003e, specifically \u003cstrong\u003eThunderbird 350 \/ NTB 350\u003c\/strong\u003e and \u003cstrong\u003eThunderbird 500 \/ NTB 500\u003c\/strong\u003e. This is a complete front master cylinder assembly with lever, not just the lever and not just a repair kit.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buyers Need It\u003c\/h3\u003e\n\u003cp\u003eThis part is usually replaced when front brake feel becomes poor due to internal wear, fluid leakage, crash damage, broken lever mount area, or a seized piston assembly. Replacing the complete OEM master cylinder assembly is often the cleaner solution than mixing local repair parts into a safety-critical brake component.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Royal Enfield OEM brake part\u003c\/li\u003e\n\u003cli\u003ePart number: \u003cstrong\u003e594631\/A\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eOfficial description: \u003cstrong\u003eMaster Cylinder Assy Fr. Disc - NT Lever\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eReplacement \/ supersession for older part number \u003cstrong\u003e594631\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSold as a \u003cstrong\u003efront brake master cylinder assembly with lever\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eStrong fitment support for \u003cstrong\u003eThunderbird 350\u003c\/strong\u003e and \u003cstrong\u003eThunderbird 500\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSafety-critical OEM replacement for front disc brake controls\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eVerified Compatibility\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eStatus\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eThunderbird 350 \/ NTB 350\u003c\/td\u003e\n\u003ctd\u003eConfirmed\u003c\/td\u003e\n\u003ctd\u003eDirect seller fitment explicitly lists NTB 350 for this master cylinder family.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThunderbird 500 \/ NTB 500\u003c\/td\u003e\n\u003ctd\u003eConfirmed\u003c\/td\u003e\n\u003ctd\u003eDirect seller fitment explicitly lists NTB 500 for this master cylinder family.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther Royal Enfield models\u003c\/td\u003e\n\u003ctd\u003eDo not assume\u003c\/td\u003e\n\u003ctd\u003eThis listing is kept conservative around the strongest proven Thunderbird-family fitment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e1 x Genuine Royal Enfield Front Brake Master Cylinder Assembly with Lever – 594631\/A\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBuyer-Focused Fitment Note\u003c\/h3\u003e\n\u003cp\u003ePlease order only after matching your bike to the \u003cstrong\u003eThunderbird 350 \/ Thunderbird 500 front disc brake setup\u003c\/strong\u003e and confirming the old part number. This is a \u003cstrong\u003ecomplete front master cylinder assembly with lever\u003c\/strong\u003e, not just the lever and not just a repair kit.\u003c\/p\u003e\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e1. What is 594631\/A?\u003c\/strong\u003e\u003cbr\u003eIt is the genuine Royal Enfield \u003cstrong\u003efront brake master cylinder assembly with lever\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Which bikes can I safely buy this for?\u003c\/strong\u003e\u003cbr\u003eThe strongest current fitment support is for \u003cstrong\u003eThunderbird 350 \/ NTB 350\u003c\/strong\u003e and \u003cstrong\u003eThunderbird 500 \/ NTB 500\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Is it OEM?\u003c\/strong\u003e\u003cbr\u003eYes. It is listed as a genuine Royal Enfield part in OEM-style parts sources.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e4. Did it replace an older part number?\u003c\/strong\u003e\u003cbr\u003eYes. \u003cstrong\u003e594631\u003c\/strong\u003e is shown as replaced by \u003cstrong\u003e594631\/A\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5. Is it only the lever?\u003c\/strong\u003e\u003cbr\u003eNo. It is the \u003cstrong\u003emaster cylinder assembly with brake lever\u003c\/strong\u003e, not just the lever.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e6. Is this the front or rear master cylinder?\u003c\/strong\u003e\u003cbr\u003eThis is the \u003cstrong\u003efront\u003c\/strong\u003e brake master cylinder.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e7. What should I check before ordering?\u003c\/strong\u003e\u003cbr\u003eCheck your bike model, front brake setup, old master cylinder number, and exact part number \u003cstrong\u003e594631\/A\u003c\/strong\u003e.\u003c\/p\u003e","brand":"Royal Enfield","offers":[{"title":"Default Title","offer_id":51390506762535,"sku":"594631\/A","price":1288.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/594631_Master_Cylinder.png?v=1778695898","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-594631-a-front-brake-master-cylinder-thunderbird-350-500","provider":"UNDER THE HOOD","version":"1.0","type":"link"}