Patent ID: 8631912

Claim:
A brake caliper for a disk brake comprising: a caliper housing including a bore that extends along a bore axis and a radial groove formed along a surface of the bore; a piston moveably mounted within the bore along the bore axis in an application direction and a return direction, wherein in the application direction the piston is configured to apply a brake lining against a brake disk and in the return direction the piston is configured to release the brake lining from the brake disk; a sealing ring positioned in the radial groove and adjacent the piston; wherein the radial groove includes a flat, revolved and continuous base surface of a given width, wherein the base surface of the radial groove approaches the bore axis in the application direction, wherein each end of the flat revolved base surface intersects a side surface of the groove at a fillet, wherein each side surface extends between the base surface and the surface of the bore, wherein the base surface of the radial groove extends in a given plane across its width, wherein the given plane and the bore surface are not parallel, wherein each side surface intersects the surface of the bore at a chamfer of the radial groove, wherein the chamfer that is on an application-side of the radial groove encloses a first angle (φ) with respect to the bore surface, and wherein the chamfer that is on a return-side of the radial groove encloses a second angle (γ) with respect to the bore surface that is larger than the first angle (φ), wherein a gap (Ü) of greater than about 0.5 millimeters is provided between the sealing ring and a surface of the groove.