High-quality replacement piston seal designed for StopTech high-performance braking systems and various OEM applications. This 30mm inner diameter seal is engineered to withstand extreme temperatures and maintain hydraulic pressure integrity during aggressive driving conditions. It is essential for rebuilding calipers to ensure leak-free operation and optimal pedal feel. Part items included: 1 x 30mm High-Temp Silicone/EPDM Piston Seal (Art. 753.99001S). Compatible with Brembo, StopTech ST-40/ST-60 calipers, and selected Japanese/European OEM braking systems utilizing 30mm pistons.