Square O-Ring Kit 1.62/1.12/1.12

The Square O-Ring Kit 1.62/1.12/1.12 (WIL130-5972) from Wilwood is a precision brake caliper rebuild kit designed to restore or maintain hydraulic integrity in high-performance braking systems. This kit is essential for maintaining vehicles in demanding applications, such as law enforcement and military transport, where reliable braking performance is critical for safety.

The kit includes three square o-rings—one measuring 1.62 inches and two measuring 1.12 inches—engineered to seal piston chambers within various Wilwood brake calipers. The square-profile design offers superior sealing capabilities compared to standard round profiles, effectively resisting extrusion under high pressure and maintaining consistent contact with caliper bore walls. Made from high-grade rubber compounds, these seals are resistant to thermal cycling and degradation from DOT 3, 4, and 5.1 brake fluids.

Technicians and mechanics responsible for brake caliper maintenance will find this kit indispensable, particularly for vehicles that require frequent service. Its compact dimensions (5.25 x 0.65 x 6.65 inches) and lightweight design (0.06 lbs) make it practical for field replacements and transport during maintenance operations.