Patent ID: 8733513

Claim:
A disk brake, comprising: a pair of pads disposed at both sides of a disk; a caliper for slidably fitting a piston into a bottomed cylinder formed of an aluminum alloy and bringing the pair of pads in contact with the disk using slide movement of the piston; a parking brake mechanism for generating a braking force having a spring cover into which a push rod and a push rod biasing spring are inserted, mechanically protruding the piston to press the pads against the disk; a rotation control part for controlling relative rotation provided in between the cylinder and a part of the parking brake mechanism that does not rotate with respect to the push rod, the rotation control part including convex parts having curved surfaces formed at the part of the parking brake mechanism that does not rotate with respect to the push rod and concave parts having curved surfaces formed at the cylinder; and a metal spacer resiliently disposed in an inner circumference of the cylinder and including arc parts that contact with the concave parts and are disposed in the concave parts wherein an introduction hole for an operating fluid is formed at a fitting portion of the cylinder adjacent to the spacer, and a plurality of through-holes are formed in the spacer.