Cap Gasket G3

The HOWE Cap Gasket G3 is a precision replacement bellows component engineered for Howe's G3 Racing remote reservoir master cylinder systems. This compact rubber gasket seals the pressurized air gap within the remote reservoir cap assembly, preventing fluid contamination and maintaining consistent hydraulic pressure during high-performance braking applications. Measuring 2.7 x 0.7 x 2.85 inches and weighing just 0.01 lbs, the Cap Gasket G3 is a critical wear item for road racing, track days, and competitive motorsports where brake system integrity directly impacts stopping power and driver safety.

Remote reservoir master cylinders like the Howe G3 system isolate the expansion chamber from main brake circuit turbulence, reducing fluid aeration and maintaining stable pedal feel under sustained braking. The bellows gasket inside the cap seals this chamber against atmospheric ingress while accommodating normal pressure cycling. Over time, exposure to brake fluid, temperature cycling, and system pressure degrades the rubber compound, causing the seal to crack, leak, or lose elasticity. Replacement with an OEM-specification Cap Gasket G3 restores the hermetic seal and ensures the remote reservoir functions as designed.

This gasket is intended for owners and professional mechanics maintaining Howe G3 remote reservoir master cylinders in competitive and high-performance vehicles. If you notice brake fluid weeping from around the reservoir cap, a soft or inconsistent pedal feel despite fresh fluid, or visible cracks in the existing gasket, replacement of this component should be among the first diagnostics. The Cap Gasket G3 (Part Number 524352) is available individually, making it an economical repair option for single-cylinder or multiple-cylinder brake systems using Howe G3 reservoirs.