Patent ID: 7028813

Claim:
A disc brake assembly for engaging and decreasing the speed of rotation of a rotor of a wheel, including a caliper with an actuator housing, at least one brake pad mounted in said caliper for engaging the rotor, and an actuator positioned in the actuator housing for urging the brake pad into engagement with the rotor, comprising: said actuator comprising a piston assembly including a drive element and a contact element, said drive element defining a cup-shaped recess with a side wall having a cylindrical interior surface and opposed ends, with a base wall closing one of said ends and an opening at the other of said ends, with said opening facing said brake pad, said contact element having a cylindrically shaped exterior surface received through said opening of said drive element into said recess and extending from said base wall and along said cup shaped recess toward engagement with the brake pad, said contact element consisting essentially of aluminum for engaging the brake pad, and said drive element consisting essentially of steel and configured for urging said contact element toward engagement with the brake pad.