Disk brake with return, guide, and pad-thickness sensor spring

A disk brake comprising:

• a caliper housing adapted to fit over the edge of a brake disk rotatable about an axis;
• a pair of brakeshoes in said housing axially flanking said disk and each having a brake pad turned toward the respective face of said disk and a backing plate turned away therefrom and formed with a bent-in tab;
• means in said housing and engaging said backing plates for urging said brakeshoes together against said disk, said backing plates being formed with respective axially throughgoing brakeshoe passages and said housing being formed with respective housing passages in line with said brakeshoe passages;
• and
• a spring compressed axially between said brakeshoes and having
• respective legs extending toward said shoes,
• respective pusher portions extending from said legs, lying flatly against said backing plates, and engaged axially in one direction with the respective backing plate and axially in the opposite direction with the respective tab, and
• respective guide portions extending from said pusher portions and extending axially through the respective brakeshoe passage and housing passage, whereby said pusher portions urge said brakeshoes axially apart and said guide portions guide said brakeshoes in said housing.