Patent ID: 7503437

Claim:
A radially mounted disk brake comprising a caliper body adapted to be secured to a support member on a vehicle body, said caliper body comprising: a cylinder bore for receiving a piston that presses a friction pad against a disk rotor; a plurality of mounting holes spaced in a rotational direction of the disk rotor with said cylinder bore interposed therebetween and extending in a direction perpendicular to an axis of rotation of the disk rotor so that the caliper body is secured to said support member on the vehicle body with mounting bolts passed through said mounting holes; large-diameter hole portions formed at respective openings of said mounting holes on a side of the caliper body closer to said support member, and abutting surfaces provided around respective peripheral edges of said large-diameter hole portions of the mounting holes and adapted to abut against said support member on the vehicle body, wherein, cylindrical step portions are formed on said support member to protrude toward the caliper body from associated bearing surfaces of the support member, said large-diameter hole portions receiving said cylindrical step portions of said support member in such a manner that gaps are formed between bottoms of said large-diameter hole portions and distal end surfaces of said cylindrical step portions when the caliper body and the support member rejoined to each other with said mounting bolts, and the gaps are positioned outward of an innermost portion of said cylinder bore with respect to a radial direction of the disk rotor, wherein, along an axis of each of said mounting holes, the position of said abutting surface of said caliper body and the associated bearing surface of said support member is located outward of an innermost portion of said cylinder bore with respect to a radial direction of the disk rotor.