This Replacement Hayes Dominion T2 Brake Caliper is the most powerful 2-piston caliper in cycling, and also has the distinction of having the highest power to weight ratio, using the largest 26mm pistons, almost the same piston area as the combined piston area as the T4 4-piston caliper.  The complete T2 brake is actually more powerful than most 4-piston brakes.  It provides excellent stopping power for both front and rear wheels, or use this caliper on the rear with the T4 up front (this is what I run). The caliper is brand new and made by Hayes Brake, a trusted name in the cycling industry. This part type is perfect for those looking to upgrade their current braking system or replace a worn-out caliper. This Hayes Dominion T2 Brake Caliper is sure to enhance your cycling experience.