Round O-Ring Kit- 1.75in

The Wilwood Round O-Ring Kit 1.75in (Part Number 130-0047) is a precision brake caliper rebuild kit designed for high-performance braking system maintenance. This o-ring and rubber seal kit restores hydraulic integrity to Wilwood brake calipers with 1.75-inch pistons, ensuring consistent brake modulation and eliminating fluid weeping that compromises stopping power under sustained braking conditions.

Brake caliper seal degradation occurs gradually through thermal cycling, exposure to brake fluid additives, and normal wear—typically requiring rebuild intervals of 2–4 years depending on vehicle duty cycle and storage conditions. The 1.75-inch piston size is standard across Wilwood's entry-level and mid-range caliper platforms, making this kit compatible with a broad range of track vehicles, street performance builds, and vehicle restoration projects. Original equipment seals and o-rings are engineered to OEM tolerances and material specifications; replacement with factory-equivalent components preserves brake feel and maintains manufacturer warranty integrity on rebuild work.

Technicians, brake system rebuilders, and vehicle owners performing in-house caliper maintenance rely on complete o-ring kits to avoid partial rebuilds that lead to recurring leaks and repeat labor. The compact 5.2 x 0.55 x 6.65-inch package contains all elastomer seals required for a single 1.75-inch piston caliper rebuild. Sourcing correct replacement seals from the manufacturer eliminates guesswork and reduces downtime on vehicles where brake system reliability directly impacts safety and performance.