Opposed-piston disc brake

An opposed-piston disc brake comprising:

• a caliper body including an inner caliper portion and an outer caliper portion facing the inner caliper portion, the inner caliper portion and the outer caliper portion being connected to each other via bridge portions extending over a disc rotor;
• pistons inserted into corresponding cylinders provided at the inner caliper portion and the outer caliper portion, the pistons being hydraulically operated;
• brake pads arranged to face each other and being thrust by the pistons to slidably contact the disc rotor;
• cylinder connection oil passages respectively connected to the cylinder of the inner caliper portion and the cylinder of the outer caliper portion;
• passage communication bores respectively formed at the bridge portions to extend in an axial direction of a disc in a substantially straight manner;
• and
• an air bleeder screwed into a bleeder hole to fill the bleeder hole, the bleeder hole formed to be connected to an inner end portion of one of passage communication bores, wherein
• the cylinder connection oil passages are formed using a core at the time when the caliper body is cast,
• the cylinder connection oil passages extend from bottom portions of the cylinders to the passage communication bores in a radially outer direction of the disc,
• ends of the cylinder connection oil passages in a longitudinal direction thereof are directly connected to the passage communication bores,
• in a state where the caliper body is mounted on a vehicle, a top portion of an inner wall surface of one of the passage communication bores, formed at the bridge portion formed at an upper side of the caliper body, is positioned higher than the ends of the cylinder connection oil passages,
• in a state where the caliper body is mounted on the vehicle, the cylinder connection oil passages are directly connected to one of the passage communication bores, formed at the bridge portion formed at the upper side of the caliper body,
• one of the cylinder connection oil passages, connected to the cylinder of the inner caliper portion, extends in the radially more outer direction of the disc than the other cylinder connection oil passage, connected to the cylinder of the outer caliper portion, and wherein
• one of the passage communication bores, formed at the bridge portion formed at the upper side of the caliper body, is formed so as to incline relative to the axial direction of the disc, so that an inner side of the passage communication bore is positioned higher than the outer side thereof.