At DMG Motorsports, we present the All Balls Master Cylinder Rebuild Kit (21-81031) — a precision-engineered rear brake master cylinder rebuild kit designed to bring tired, leaking brake systems back to like-new performance. Rather than replacing an entire master cylinder assembly, this kit gives you every internal component required to properly re-seal and refurbish your existing unit, saving you time and money while restoring confident braking feel. Built to OEM specifications, it's the trusted choice for riders who want a reliable, no-guesswork repair.

This kit is designed to fit the rear brake master cylinder on the Kawasaki ZX600 (ZX-6R) (636) 2003-2004, ZX600 (ZX-6R) 1999-2002, ZX600 (ZX6RR) 2003-2005, and ZX600 (ZZR) 2005-2008. Always verify fitment against your specific model and year before ordering.

Features:

• Contains all parts needed to re-seal a leaking rear brake master cylinder in one complete kit
• Includes cup seals, copper washers, O-rings, and replacement screws where applicable
• Engineered to meet OEM fitment and performance specifications for a reliable repair
• Fits rear master cylinders on Kawasaki ZX600 (ZX-6R) (636) 03-04, ZX600 (ZX-6R) 99-02, ZX600 (ZX6RR) 03-05, and ZX600 (ZZR) 05-08
• Convenient all-in-one kit eliminates the hassle of sourcing individual seal components separately
• Backed by All Balls Racing's reputation for durable, dependable aftermarket powersports hard parts

Fitment