Caliper body and method of manufacturing caliper body of vehicular disk brake

A casting method for manufacturing a caliper body of a vehicular disc brake, said caliper body 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 casting method comprising:

• casting the caliper body by forming a cavity with a side of molding the bottom portion of said cylinder disposed in the upper part of and in the vertical direction of said cavity and with the side of molding said reaction pawl disposed in the lower part of and in the vertical direction thereof;
• forming a sprue at the bottom portion with a base material, 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.