{"product_id":"ate-hauptbremszylinder-24-2122-0504-3-tandem-22-2-mm-bremszylinder-japan-nos-ovp","title":"ATE Master Cylinder 24.2122-0504.3 Tandem 22.2 mm Brake Cylinder Japan NOS OVP","description":"\u003cdiv style=\"background:#242833;border-radius:8px;padding:18px 20px;margin:0 0 14px;color:#ffffff;\"\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong style=\"color:#c69a3a;\"\u003eTandem master cylinder ATE 24.2122-0504.3 with 22.2 mm piston diameter, NOS from Japan.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;color:#cfd3dc;\"\u003eNOS – unused in original box  ·  Piston diameter 22.2 mm factory-marked  ·  \u003cstrong style=\"color:#c69a3a;\"\u003eTwo separate brake circuits\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003eCondition of this part\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eNew old stock (NOS – New Old Stock), unused in the original ATE box with factory label HAUPTZY.\/MASTERCYL. and the sticker Original spare part from Japan. Cast housing free of installation marks, flange and piston bore bare, reservoir clear and clean, connection threads undamaged. The box shows storage-related aging and a torn corner; the part itself is in perfect condition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eFunction and location\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eThe tandem master cylinder converts the pedal force, boosted by the brake booster, into hydraulic pressure. Two pistons in series in a common bore supply two separate brake circuits – if one circuit fails, the second remains functional. The mounted reservoir buffers volume changes from pad wear and temperature; the connector on the reservoir is the warning contact for the brake fluid level.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eInstallation location: mounted on the front of the brake booster on the engine compartment bulkhead, with the push rod from the brake pedal and the brake lines at the side outlets.\u003c\/p\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eHow can you tell that a master cylinder is faulty?\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 16px;padding-left:20px;\"\u003e\n\u003cli\u003eBrake pedal can be depressed further or feels spongy\u003c\/li\u003e\n\u003cli\u003eWarning contact on the reservoir signals low brake fluid\u003c\/li\u003e\n\u003cli\u003eDecreasing or uneven braking performance if one circuit fails\u003c\/li\u003e\n\u003cli\u003eVisible fluid leakage at the housing or at the line connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"margin:0 0 16px;\"\u003eOn the yellow ATE factory label, the number is clearly legible as .2122-0504.3; the first two digits are partly covered by an ink stain, with the first digit 2 recognizable. Based on the ATE numbering system and the sister part from the same delivery, 24. is the obvious reading, so the part is offered under the number 24.2122-0504.3. In ATE hydraulic cylinder numbers, the block 2122 codes the piston diameter 22.2 mm – for comparison: 2119 = 19.0 mm, 2120 = 20.64 mm, 2123 = 23.8 mm, 2125 = 25.4 mm.\u003c\/p\u003e\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003e⚠ Important: compare the part number before buying\u003c\/p\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003eNo vehicle assignment can be confirmed for this number – the ATE Classic catalogs C3 and C4, the ATE manufacturer catalogs on the relevant parts portals, as well as eBay and Kleinanzeigen, were checked. It is most likely a discontinued number from an older ATE program for imported vehicles. The sale is therefore based on part number, bore diameter and photo – please compare the number, bore diameter, number and position of the line connections, and the flange pattern with your old part.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;font-weight:700;\"\u003eDoes not fit:\u003c\/p\u003e\n\u003cul style=\"margin:0;padding-left:20px;\"\u003e\n\u003cli\u003eCylinders with a different bore diameter – 2119 = 19.0 mm, 2120 = 20.64 mm, 2123 = 23.8 mm, 2125 = 25.4 mm are separate numbers.\u003c\/li\u003e\n\u003cli\u003eWithin the 24.2122 series, versions differ by number of connections (2, 3 or 4) and connection thread (M10x1 or M12x1) – please compare with the old part.\u003c\/li\u003e\n\u003cli\u003eBuying by vehicle model alone: no vehicle list is available, please buy based on number and dimensions.\u003c\/li\u003e\n\u003cli\u003eBrakes are safety-relevant: installation by qualified personnel only, followed by bleeding the brake system and checking its function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this part fit your car?\u003c\/strong\u003e Send us the VIN (chassis number) and model year – we'll check it for free: \u003ca href=\"tel:+491798991069\"\u003e0179 8991069\u003c\/a\u003e (Mon–Fri 8 am–6 pm) or via our \u003ca href=\"\/en\/pages\/contact?thema=Ersatzteil\"\u003econtact form\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3 style=\"margin:22px 0 8px;\"\u003eFAQ\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eIs the part number reliably deciphered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eOn the factory label, .2122-0504.3 is clearly legible; the block 2122 stands for the piston diameter 22.2 mm. The first two digits are partly obscured by an ink stain and were completed as 24. based on the ATE numbering system and a sister part from the same delivery. We're happy to send an additional photo of the label on request.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eWhich vehicles does this cylinder fit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eNo vehicle fitment can be confirmed for this number, so we deliberately give no vehicle list here. Please compare part number, bore diameter (22.2 mm), number of connections and connection thread with your old part.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 4px;\"\u003e\u003cstrong\u003eWhat's included in the scope of delivery?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eThe exact scope of delivery can be seen in the product photos.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKFZTeile-Thot\u003c\/strong\u003e specialises in spare parts for Mercedes classic cars. Free shipping within Germany, 60-day return policy.\u003c\/p\u003e","brand":"ATE","offers":[{"title":"Default Title","offer_id":54960884154697,"sku":"90035","price":149.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0913\/5344\/8777\/files\/57_04e02ee7-350b-4dc0-863f-6edee9416008.jpg?v=1787304202","url":"https:\/\/kfzteile-thot.de\/en\/products\/ate-hauptbremszylinder-24-2122-0504-3-tandem-22-2-mm-bremszylinder-japan-nos-ovp","provider":"KFZTeile-Thot","version":"1.0","type":"link"}