High-performance StopTech ST Caliper Repair Kit designed for professional rebuild of one pair of calipers. This kit ensures optimal pressure retention and debris protection for braking systems under extreme conditions. Includes components for 28mm pistons: 2x 28mm High-Temp Pressure Seals (P/N 143.99028-S), 2x 28mm External Dust Boots (P/N 143.99028-B). Engineered for StopTech Big Brake Kits (BBK) and compatible racing calipers.