At DMG Motorsports, we present the All Balls Racing Master Cylinder Rebuild Kit (21-81030) — a precision-engineered service kit designed to bring a tired, leaking rear brake master cylinder back to like-new condition. Rather than replacing an entire master cylinder assembly, this kit gives riders and technicians an affordable way to restore proper hydraulic pressure and stop fluid leaks at the source. Built specifically for Brembo-style rear master cylinders found on select KTM, Husqvarna, Husaberg, and GasGas off-road and dual-sport models, this kit is a must-have for any rider tackling routine brake maintenance or troubleshooting a soft, spongy, or leaking rear brake.

Every component in this rebuild kit is selected to match OEM specifications, ensuring a proper seal and reliable performance once your master cylinder is back in service. Whether you're doing preventative maintenance on a well-used machine or repairing a system that's already showing signs of fluid loss, this kit contains everything needed to get the job done right the first time.

Features:

• Contains all parts needed to re-seal a leaking rear brake master cylinder
• Includes cup seals, copper washers, o-rings, and replacement screws where applicable
• Designed to restore master cylinder performance and stop fluid leaks
• Fits select Brembo-equipped rear master cylinders on KTM, Husqvarna, Husaberg, and GasGas models
• Direct-fit replacement components engineered for a reliable, long-lasting seal
• Simplifies routine brake system maintenance without replacing the entire master cylinder

Fitment