{"product_id":"mwmnun-12mm-rear-hydraulic-brake-master-cylinder-caliper-for-70-150cc-pit-bikes-pre-filled-includes-spare-pads","title":"MWMNUN 12mm Rear Hydraulic Brake Master Cylinder \u0026 Caliper for 70–150cc Pit Bikes — Pre-filled, Includes Spare Pads","description":"\u003cp\u003e\u003cstrong\u003eCompact 12mm rear hydraulic brake master cylinder and caliper assembly engineered to replace worn rear brakes on 70cc–150cc Chinese pit and dirt bikes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis complete rear brake kit from MWMNUN arrives ready to install with brake fluid and pads already fitted, simplifying replacement or upgrade on compatible small-displacement bikes. It’s built to mount to frames with a 12mm rear wheel shaft and fits many popular models from manufacturers such as SSR, Baja, Apollo, Taotao, Coolster, Roketa, SDG, Pitster Pro, Atomik and Sikk. The package includes one assembled master cylinder\/caliper and an extra set of brake pads for quick servicing.\u003c\/p\u003e\n\n\u003ch3\u003eWhich motorcycles will this rear brake assembly work with?\u003c\/h3\u003e\n\u003cp\u003eIt’s designed specifically for bikes with a 12mm rear axle; it does not fit models that use a 15mm axle. Typical applications are 70cc, 90cc, 110cc, 125cc, 140cc and 150cc pit or dirt bikes from common Chinese and entry-level brands. Always check your bike’s axle diameter and mounting points before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with many SSR, Baja, Apollo, Taotao, Coolster, Roketa, SDG, Pitster Pro, Atomik and Sikk models\u003c\/li\u003e\n  \u003cli\u003eAccepts 12mm rear wheel shaft only — not for 15mm axles\u003c\/li\u003e\n  \u003cli\u003eFits a range of 70–150cc small-displacement dirt and pit bikes\u003c\/li\u003e\n  \u003cli\u003eIncludes installation-ready master cylinder with fluid and pads installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to install the MWMNUN rear master cylinder and caliper?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone familiar with basic motorcycle maintenance. The assembly comes pre-filled with brake fluid and pads installed, so you won’t need to bench-bleed the caliper in most cases. Standard tools and a torque wrench will be sufficient for mounting and hose connection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-assembled with fluid and pads — reduces prep time\u003c\/li\u003e\n  \u003cli\u003eMounts to bikes with matching 12mm shaft and existing brake lever\/hose fittings\u003c\/li\u003e\n  \u003cli\u003eMay require minor hose routing or banjo bolt adjustment for exact fit\u003c\/li\u003e\n  \u003cli\u003eIncludes an extra pair of brake pads for immediate spares\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and performance details should I expect?\u003c\/h3\u003e\n\u003cp\u003eThe unit is a standard hydraulic master cylinder and caliper combination built for daily use on off-road and recreational bikes. It’s intended to restore reliable rear braking rather than improve racing performance. Construction focuses on durability and serviceability, with replaceable pads and a serviceable bleeder valve.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHydraulic master cylinder paired with a single rear caliper\u003c\/li\u003e\n  \u003cli\u003eReplaceable brake pads included and additional spare pads in box\u003c\/li\u003e\n  \u003cli\u003eServiceable bleeder valve for routine maintenance\u003c\/li\u003e\n  \u003cli\u003eDesigned for everyday off-road braking loads, not high-performance racing upgrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat after-sale support and warranty are provided?\u003c\/h3\u003e\n\u003cp\u003eMWMNUN backs the product with a lifetime warranty and offers customer support for fitment or quality questions. If you’re unsure about compatibility with your specific bike, contact the seller before purchase so they can confirm fit or recommend an alternative. Warranty covers manufacturing defects under normal use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLifetime warranty against manufacturing defects\u003c\/li\u003e\n  \u003cli\u003eCustomer support available for fitment and quality inquiries\u003c\/li\u003e\n  \u003cli\u003eReturn or replacement processes guided by seller policy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This rear brake master cylinder and caliper assembly is aimed at owners of 70–150cc pit and dirt bikes who need a direct replacement for a worn or damaged rear brake on a bike with a 12mm rear axle. It’s ideal for DIY mechanics, small repair shops, and riders who want a ready-to-mount, serviceable brake unit that includes pads and fluid for a fast turnaround.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this fit my 110cc pit bike?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If your bike uses a 12mm rear wheel shaft and standard rear brake mounting, it likely fits. Check axle diameter before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are brake pads and fluid included?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the unit ships with brake fluid and pads installed plus one extra pair of spare brake pads.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MWMNUN","offers":[{"title":"Default Title","offer_id":48085913141406,"sku":"B08SWFRBDT","price":45.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mwmnun-rear-brake-assembly-front-view.jpg?v=1785880489","url":"https:\/\/northtrailauto.ca\/products\/mwmnun-12mm-rear-hydraulic-brake-master-cylinder-caliper-for-70-150cc-pit-bikes-pre-filled-includes-spare-pads","provider":"North Trail Auto","version":"1.0","type":"link"}