Disk brake return spring

A disk brake having a pair of friction pads provided at respective positions which face each other across a disk, a caliper having a disk pass portion extending across said friction pads and moving both said frictions pads toward said disk, and a return spring connecting said friction pads and biasing them away from said disk, wherein the improvement comprises

• said return spring having engagement portions respectively provided at both ends thereof and retained by being inserted into respective retaining holes formed in said friction pads at ends thereof which are closer to the outer periphery of said disk, and a spring function portion provided between said engagement portions to connect them together,
• said engagement portions being disposed so that after said caliper has been mounted, said engagement portions lie inside said disk pass portion of said caliper in a state where said engagement portions are retained by said retaining holes,
• a protuberance provided on the inner side of said disk pass portion of said caliper circumferentially of said disk along a side edge of said disk pass portion,
• a recess formed on the inner side of said disk pass portion so as to extend continuously from said protuberance toward a central portion of said caliper, and
• first and second angularly bent portions formed at each end of said return spring in the portion between said engagement portion and said spring function portion so that after said caliper has been mounted, said return spring is in contact at said first bent portion with an entrance portion of said retaining hole, while said spring function portion is in contact with said protuberance at a region including said second bent portion, and said return spring is in contact at a distal end of said engagement portion with an innermost portion of said retaining hole.