Seal Kit G3 M/C 7/8in

The Seal Kit G3 M/C 7/8in from HOWE (MPN 524314K) is a precision master cylinder rebuild kit engineered for high-performance hydraulic brake systems. Designed specifically for HOWE G3-style master cylinders with a 7/8-inch bore, this seal kit restores original sealing integrity and pressure retention in racing, street performance, and heavy-duty applications. Whether you're rebuilding after years of service or maintaining a fresh competition platform, this kit addresses the most common wear points that compromise brake feel and system responsiveness.

The 7/8-inch bore master cylinder is the industry standard for mid-range hydraulic systems, balancing pedal effort against fluid displacement for responsive modulation. The G3 seal kit includes all necessary elastomer components—primary and secondary seals—manufactured to OEM specifications and tolerances that ensure leak-free operation and consistent brake pressure delivery. These seals are engineered to withstand the thermal cycling and pressure spikes common in performance driving, delivering reliable sealing across repeated heat cycles without degradation. At just 0.07 lbs, the complete kit is compact and ready to install during routine master cylinder maintenance or emergency rebuild procedures.

Mechanics and performance enthusiasts working with HOWE master cylinders benefit most from this kit during preventive maintenance or after detecting spongy pedal feel or creeping brake line pressure. Installation requires basic familiarity with master cylinder disassembly and fluid system bleeding; the compact dimensions (5.15 x 0.9 x 6.6 inches) fit easily in a service kit or shop drawer. Compatibility is straightforward—verify your HOWE master cylinder bore size matches 7/8 inch and confirm G3-style construction before ordering. This is a direct OEM replacement, making it the correct choice for maintaining brake system integrity in street rods, race cars, and vintage restorations.