Patent ID: 8020674

Claim:
A disk brake for a vehicle comprising: a caliper bracket fixed to a vehicle body; a pair of caliper support arms provided in the caliper bracket that extend and stride over an outer edge of a disk rotor in the axial direction of a disk; U shaped pad guide grooves that are provided in the caliper support arms in opposed forms and have outer side surfaces in the radial direction of the disk, inner side surfaces in the radial direction of the disk and opposed surfaces which connect together both the side surfaces; and lug pieces that respectively protrude on both side parts of back plates of friction pads arranged with the disk rotor sandwiched between them and are respectively supported by the pad guide grooves through a pad retainer, the pad retainer including a pair of retainer parts attached to the pad guide grooves at both the sides of the disk rotor, a connecting piece that strides over the outer edge of the disk rotor to connect the pair of retainer parts and pad resilient parts that urge the friction pads outward in the radial direction of the disk, wherein: the retainer parts include inner side pieces arranged along the inner side surfaces of the pad guide grooves in the radial direction of the disk, outer side pieces arranged along the outer side surfaces of the pad guide grooves in the radial direction of the disk and interior pieces that connect the outer side pieces to the inner side pieces in interior parts of the pad guide grooves and are arranged along the opposed surfaces; and the outer side pieces include impact suppressing parts that restrain the lug pieces from colliding with the outer side surfaces in the radial direction of the disk through the outer side pieces.