Monster Scooter Parts offers a great price on the complete front right master cylinder for QMB139 scooters. Our master brake cylinder will work on many modern scooter models using the popular QMB139 GY6 engine. No one knows for sure, but scooters using the QMB139 GY6 engine may actually be the most common type in production today.
Please refer to the Compatibility tab to find if our hydraulic brake cylinder is the right fit for your scooter. However, with so many Chinese-made scooters using this style, we can't even begin to list them all, so the photo above may be your best reference for fitment.
Length: 10" (250mm)
Opening: 7/8" (22mm)