EXNAVI 4 Piston Hydraulic Brake Repair Parts Upgrade kit Ceramic Piston Perfect Substitute for Shimano Brake Caliper 4-Piston M640 M810 M820 M7120 M8020 M8120 M9120

Only suitable for Shimano MT420 MT520 M640 M6120 M7120 M810 M820 M8020 M8120 M9120, not applicable to other than these models Extreme environment tolerance: Working heat resistance is greater than 400 degrees Celsius, with heat insulation and heat resistance effect Top material safety guarantee: Automotive-grade brake synthetic phenolic resin，The same material standard as motor car , impact resistance, aging resistance, solves the fatal defect of traditional ceramic pistons that are fragile and cause oil leakage Turbofan airflow design with eight-point contact with the piston for better heat dissipation Strong and durable, no breaking or cracking, Solve the original brake ceramic breaking and oil leakage problem, No worries about oil leakage