Product Details
Description
Rear Brake Arm Kit; CSC go., 139QMB Scooters
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc
- Engine Code: 139QMB
- Fits Models / Common Applications: CSC and other compatible models may apply.
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.
Q: Will this fit a CSC?
A: This SKU is listed with CSC model fitment where the scooter also matches the listed engine or fitment notes.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 0.441 lbs |
|---|---|
| Dimensions | 5.5 × 4 × 1 in |
Restore rear drum brake function with this QMB139 / GY6 Rear Drum Brake Arm Kit. Three-piece zinc yellow-chromate plated steel kit includes the stamped brake arm (cable hook slot at top, pivot hole at bottom, cam adjuster nub), a knurled brake shoe pivot pin that the drum brake shoes rotate around inside the hub, and a flanged hex mounting bolt. Fits most QMB139 50cc and GY6 125/150cc Chinese scooters with rear drum brakes.
Kit Contents
- Stamped steel rear brake arm with cable hook slot and pivot hole
- Knurled brake shoe pivot pin
- Flanged hex mounting bolt
- SKU: 1000-4026
- Finish: Zinc yellow-chromate plate
- Brake Type: Rear drum
- Dimensions: 5.5" L x 4" W x 1" H
Universal fit for most QMB139 50cc and GY6 125/150cc Chinese scooters equipped with rear drum brakes. Fits Chicago Scooter Company Go, Go MAX, Bella Classic 50, Nitro Sport 50, Pug 50, and similar QMB139/GY6-based models.





