Bicycle caliper brake assembly

A bicycle caliper brake assembly comprising:

• a support shaft having an intermediate flange;
• a pair of calipers respectively having bosses rotatably fitted on said shaft axially one behind the other, so said calipers are pivotally movable toward and away from each other;
• said bosses respectively defining annular accommodating spaces;
• said bosses being axially movable relative to each other on said shaft to assume their respective preassembled and assembled positions;
• locking means adjustably mounted on said shaft so that said bosses are interposed between said locking means and said flange;
• one of said calipers being formed with a projecting portion which engages the other caliper to prevent it from pivoting away from said one caliper more than a predetermined amount when said bosses assume said assembled position but which disengages from said other caliper to allow it to pivot away from said one caliper more than said predetermined amount when said bosses assume said preassembled position;
• a pair of coil springs each housed completely within the accomodating space of a corresponding boss and having one end engaging said corresponding boss at a fixed position relative thereto;
• and
• a pair of engaging disks non-rotatably but axially slidably fitted on said shaft between said bosses and each engaging the other end of a corresponding coil spring, so that each engaging disk is movable toward and away from the other engaging disks while maintianing engagement with said other end of said corresponding coil spring.