Fitment questions?
Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.
Product details
This square-ring kit supplies four piston seals in the listed 1.250/1.120-inch ID combination. It is the mixed-size pack for the manufacturer-assigned BSL4R or IRGT-4R configuration, using a 0.099-inch section. Selection requires the exact service-kit reference as well as the ring dimensions. Bill Wood founded Wilwood Engineering in 1977; the company is based in Camarillo, California. Wilwood designs and manufactures disc brake systems and components, from calipers and brake rotors to master cylinders, valves, fittings and brake lines, for motorsport, street-performance and specialized applications; selection depends on the complete brake system.
Technical Details
- Manufacturer part number: 130-7221
- Service component: Caliper Square Ring Kit
- Seal profile: Square-Ring
- Manufacturer-listed seal inside diameters: 1.250 / 1.120 inches
- Listed seal thickness: 0.099 inch
- Manufacturer material code: 210M
- Pack quantity: 4 Pack
- Seal fluid compatibility: DOT 3, DOT 4 and DOT 5 as specified for these seals. Follow the complete caliper and vehicle fluid requirements; do not mix silicone DOT 5 with DOT 3, DOT 4 or DOT 5.1.
Fitment & Compatibility
Check the caliper identity and preserve the correct size at each piston during fitting. A nearby diameter sequence from the same family is a different service set. Inspect the piston and housing surfaces and identify any additional rubber components or hardware from the caliper’s own parts list and condition.
PMB Performance brings over 20 years of brake and parts experience to selection questions. Send the existing caliper reference and brake-package details for help checking compatibility.
