Patent ID: 7232015

Claim:
A caliper body of a vehicular disc brake to be made by a casting method, said vehicular disc brake having a pair of frictional pads disposed opposite to each other with a disc rotor held therebetween, said caliper body including a cylinder disposed on one side of the disc rotor, a reaction pawl disposed on the other side of the disc rotor, and a bridge for coupling said cylinder and said reaction pawl at the outer peripheral side of the disc rotor, said caliper body comprising: a sprue which is formed at the bottom portion of said cylinder of the caliper body for molding the caliper body with a base material, wherein the caliper body is molded with a cavity disposed with a union hole formed from the sprue, while the side of molding said bottom portion of said cylinder is disposed in a vertically upper part of said cavity and also the side of molding said reaction pawl is disposed in a vertically lower part of said cavity, wherein a one side of providing said cylinder is made an action chamber; an other side of molding said reaction pawl and said bridge is made a reaction chamber; and a thick-walled connection between said cylinder and said bridge is made a central chamber, and the ratio of volume of the central chamber to that of the reaction chamber is in the range of 0.6 to 1.25, and the ratio of volume of the central chamber to that of the action chamber is in the range of 0.7 to 1.35.