Product Details
Description
NCY Universal 4-Piston Caliper (Black); Right Side is a replacement piston assembly for compatible 139QMB scooter engine repairs or rebuilds.
Replacement Part Details
Use this part when the original component is worn, damaged, missing, or no longer working correctly. Many scooter parts can look similar but use different sizes, plugs, brackets, thread patterns, or mounting styles, so careful comparison before purchase is recommended.
Related Categories
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Code: 139QMB
- Fitment Notes: Universal Fit
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Additional information
| Weight | 2.35 lbs |
|---|---|
| Dimensions | 10 × 3 × 5 in |
The NCY Universal 4-Piston Brake Caliper delivers a significant braking upgrade for scooters, mini-motos, and small-displacement motorcycles running aftermarket brake setups. With four pistons working in tandem, this caliper generates substantially more clamping force than a standard 2-piston OEM unit, translating to shorter stopping distances, improved modulation, and more consistent feel under repeated hard braking. The right-side mounting orientation and universal bracket design make it adaptable to a wide range of custom and aftermarket fork configurations.
- 4-piston design for increased clamping force over OEM 2-piston calipers
- Right-side mounting; universal bracket fitment for custom and aftermarket applications
- Anodized black finish for corrosion resistance and clean aesthetics
- Compatible with standard brake line fittings
- Best paired with the NCY 245mm Floating Disc Brake Rotor for maximum braking performance and thermal stability (may require NCY Caliper Adapter depending on application).Â
- Sold individually; brake line and hardware not included
California Residents: This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit P65Warnings.ca.gov.





