Patent ID: 8708113

Claim:
A brake system comprising: a first friction material having a first frictional surface, the first frictional surface including first protrusions; a second friction material having a second frictional surface moving with respect to the first frictional surface, the second frictional surface including a plurality of second protrusions which is arranged along a movement direction of the second frictional surface with respect to the first frictional surface; and a soft member that is softer than the first protrusions and the second protrusions and that covers peripheries of either the first protrusions or the second protrusions such that the first protrusions or the second protrusions are exposed only in the vicinities of the peaks of the first protrusions or in the vicinities of the peaks of the second protrusions, wherein the first protrusions are supported elastically in a direction perpendicular to the second frictional surface, and when the first frictional surface moves with respect to the second frictional surface, the first protrusions abut on the respective second protrusions continuously, and only the vicinities of the peaks of the first protrusions and the vicinities of the peaks of the second protrusions abut on each other.