This is the ProBld Dual Master Cylinder Kit — designed from the ground up with all the features we wished every master cylinder had. Flip-up levers prevent damage in tight spaces or crashes, built-in brake light switches are plug-and-play, and mirror mounts are integrated. Built for clean, reliable hydraulic control on scooters running front + rear disc brakes.
The Details ▶
If you’ve ever run hydraulic brakes on a scooter build, you know the master cylinders on the market are either missing features, built cheaply, or require modification to work properly. These solve all of that.
Key features and why they matter:
Flip-Up Safety Levers — avoid snapping levers if the bike tips or hits the garage door frame.
Integrated Brake Light Switches — each master includes a pre-wired switch with extra-long harnesses for plug-and-play installation.
Mirror Mounts Built In — no more choosing between mirrors and clean controls — now you get both.
Smooth Lever Action for predictable braking feel and better modulation.
Universal Fitment for hydraulic front and rear brakes on custom builds.
These are the exact master cylinders we use on our full builds — daily riders, show bikes, stunt setups, and fully modified Ruckus platforms.
Best for:
Honda Ruckus disc conversions
Maddog and custom GY6 builds
Show builds needing clean cable routing
Riders wanting better brake feel and safety
Important Things to Note ▶
These master cylinders are designed only for front and rear disc brake conversions. They will not work with drum brakes.
Brake systems must be bled properly and used with the correct brake fluid. Brake fluid can damage paint — keep it off painted parts and components.
If you're unsure whether your setup requires this kit or which lines to pair it with, message us before installing — it's much easier to verify compatibility first.
