ProBld 4-piston brake calipers are a serious stopping power upgrade for your Ruckus or GY6 front/rear setup. Common pad shape, easy bleeding with triple bleeders, and PH82 mounting make them simple to service, while the included pads, banjo bolt, and crush washers let you bolt them on and go. Pair them with a braided line and proper mount and you’ve got legit scooter brakes.
The Details ▶
Our ProBld brake calipers are built around a common, easy-to-service caliper body that we reworked to hit the sweet spot of power, feel, and replacement part availability.
Key features:
4-piston caliper design for strong, even clamping force
Triple bleeder ports for easy bleeding no matter how it’s clocked
PH82 mounting — 82 mm from mounting hole to mounting hole
Uses common brake pad shape for easy replacement down the road
Includes banjo bolt, crush washers, and pads pre-installed
Works on front or rear setups (sold individually, not as a pair)
Match these calipers with a quality braided brake line and the correct mount and you’ll have some of the best scooter stopping power you can bolt on.
Fork compatibility: This caliper and mount are designed around our lowdown forks, and also work with NCY, Adeline, and RRGS forks. Make sure you’re running a compatible fork and the correct bracket for your rotor size.
Brake fluid warning: Brake fluid is harsh on paint and finishes. Keep it off your wheels, caliper body, and especially the ProBld logo — wipe any spills immediately.
Always bleed the system thoroughly after install, check for leaks, and re-torque hardware after a short shakedown ride.
