A piston cap assembly particularly adapted for use in a disc brake caliper, comprising: a piston body slidably movable within a caliper bore along an axis and having a closed end in contact with an actuator, and a force contact end; a piston cap having a retention portion mounted within the force contact end of the piston body, a contact portion opposite from the retention portion that contacts a brake lining, and an intermediate portion connecting the retention portion with the contact portion, wherein exterior surfaces of the contact portion, intermediate portion and retention portion define a heat transfer path between said brake lining and piston body, wherein an air gap is defined between a top edge of the piston body and an undersurface of the contact portion of the piston cap that allows air to circulate over the heat transfer path defined between said brake lining and piston body, and a diameter of the intermediate portion across said axis is different than the diameter of the contact portion to extend the heat transfer path be longer than a linear path parallel to said axis between the contact portion and the piston body, and the contact portion of the piston cap includes a central recess or opening such that only an outer periphery of the contact portion contacts a brake lining, wherein the contact portion and retention portion of the piston cap are round, characterised in that the intermediate portion of the piston cap includes a substantially hourglass-shaped sidewall between the contact portion and retention portion, and wherein the hourglass-shaped sidewall defines an air volume between an exterior surface of the piston cap and an interior surface of the piston body which communicates with said air gap. a piston body slidably movable within a caliper bore along an axis and having a closed end in contact with an actuator, and a force contact end; a piston cap having a retention portion mounted within the force contact end of the piston body, a contact portion opposite from the retention portion that contacts a brake lining, and an intermediate portion connecting the retention portion with the contact portion, wherein exterior surfaces of the contact portion, intermediate portion and retention portion define a heat transfer path between said brake lining and piston body, wherein an air gap is defined between a top edge of the piston body and an undersurface of the contact portion of the piston cap that allows air to circulate over the heat transfer path defined between said brake lining and piston body, and a diameter of the intermediate portion across said axis is different than the diameter of the contact portion to extend the heat transfer path be longer than a linear path parallel to said axis between the contact portion and the piston body, and the contact portion of the piston cap includes a central recess or opening such that only an outer periphery of the contact portion contacts a brake lining, wherein the contact portion and retention portion of the piston cap are round, characterised in that the intermediate portion of the piston cap includes a substantially hourglass-shaped sidewall between the contact portion and retention portion, and wherein the hourglass-shaped sidewall defines an air volume between an exterior surface of the piston cap and an interior surface of the piston body which communicates with said air gap.