380 series aluminum which sheds heat five times faster than traditional cast iron calipers, actually pulling heat away from the rotors. New Bi-metal piston combines a stainless steel outer piston with an aluminum inner sleeve to shed braking heat fast. The stainless steel outer piston greatly enhances piston withdrawal after braking. Oversize rubber boot is 50% thicker by design and provides a more positive and faster piston withdrawal. This feature, along with the special coating actually reduces brake heating even after repeated stops.
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