Description
Product Overview
The MWMNUN 12mm rear disc hydraulic brake master cylinder caliper is engineered to provide precise, reliable braking for a broad spectrum of off‑road motorcycles ranging from 70cc to 150cc displacement. Constructed from high‑strength aluminum alloy, the caliper offers excellent heat dissipation while maintaining a lightweight profile that does not add unnecessary mass to the rear suspension. The integrated master cylinder houses a sealed piston that delivers smooth hydraulic pressure, eliminating the need for external reservoirs or complex plumbing. Each unit arrives pre‑filled with premium brake fluid, calibrated to the optimal viscosity for immediate performance out of the box.
Compatibility is a core focus of this design. The caliper is sized for a 12mm rear wheel shaft, which is the standard on many popular dirt‑bike brands such as SSR, Baja, Apollo, Taotao, Coolster, Roketa, SDG, Pitster Pro, Atomik, and Sikk. The package includes one master cylinder, a pair of high‑friction brake pads, and a spare set of pads, giving riders the confidence to tackle steep descents and technical terrain without worrying about premature wear.
![[Product front view showing all components]](https://www.citydeal.store/wp-content/uploads/2026/07/48d6a548837e475aabe6b90cb68a1cf6.jpg)
Usage
This brake system excels in environments where precise modulation and consistent bite are essential. Whether you are navigating tight forest trails, tackling rocky hill climbs, or competing in enduro races, the 12mm hydraulic caliper provides the control needed to maintain speed and safety. The sealed master cylinder reduces the risk of fluid contamination from dust and water, a common challenge in off‑road conditions. Installation is straightforward: the caliper bolts directly to the rear axle housing, the hydraulic line connects to the existing lever, and the pre‑filled fluid eliminates the need for additional bleeding procedures.
Riders who frequently switch between different bike setups will appreciate the modular nature of this component. Because the caliper is designed for a 12mm shaft, it can be transferred between compatible frames, making it an ideal spare part for race teams and hobbyists alike. The extra set of brake pads included in the package ensures that you have immediate replacement options during long track days or remote trail rides where access to spare parts is limited.
Why Choose Us
Choosing the MWMNUN 12mm rear disc hydraulic brake master cylinder caliper means investing in a product backed by rigorous quality control and a commitment to rider safety. Each unit undergoes a multi‑stage testing process that includes pressure endurance, corrosion resistance, and thermal cycling to guarantee performance under extreme conditions. Our manufacturing facilities employ CNC machining and precision finishing to achieve tight tolerances, ensuring that the piston moves smoothly and the seal maintains integrity over thousands of braking cycles.
Beyond the hardware, we provide a lifetime warranty that covers any manufacturing defects, reflecting our confidence in the durability of the caliper. Our dedicated after‑sales team is available worldwide to assist with fit‑verification, installation guidance, and any technical inquiries you may have. This level of support distinguishes MWMNUN from generic aftermarket options, giving you peace of mind that your braking system will perform when it matters most.
Key Features
- High‑strength aluminum alloy construction for superior heat dissipation and lightweight performance.
- Pre‑filled premium brake fluid eliminates the need for on‑site bleeding, saving time and effort.
- Includes an extra pair of high‑friction brake pads for immediate replacement and extended service life.
- Designed for 12mm rear wheel shafts, ensuring a direct fit on a wide range of 70‑150cc dirt bikes.
- Lifetime warranty and dedicated after‑sales support provide confidence and assistance for any fit or quality concerns.
FAQ
Does this caliper fit bikes with a 15mm rear wheel shaft?
No. The caliper is specifically engineered for a 12mm rear wheel shaft. Installing it on a 15mm shaft would require custom adapters and could compromise braking performance.
Can I use this caliper on a bike with a different displacement, such as a 200cc model?
The caliper is optimized for 70‑150cc motorcycles. While it may physically mount on larger engines, the braking force may be insufficient for the higher power output of a 200cc bike.
What type of brake fluid is included, and can I replace it with my own?
The package comes with DOT 4 brake fluid, which is suitable for most off‑road applications. You are free to replace it with any compatible fluid if you have a preference for DOT 3 or DOT 5.1.
How do I know if the extra brake pads are compatible with my bike?
The included pads are sized for the 12mm caliper and match the standard pad dimensions used by the majority of the listed bike brands. They will fit any bike that the caliper itself fits.
What is covered under the lifetime warranty?
The warranty covers any manufacturing defects in the caliper, piston, seals, and included hardware. It does not cover damage caused by improper installation, misuse, or normal wear of the brake pads.
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