Patent ID: 6959790

Claim:
An anti-lock disc brake device mounted on a fork of a bike and corresponds to disc brake; a positioning assembly screwed on the fork, and the positioning assembly defined with teeth; a slider, a base body of which reciprocating relative to the positioning assembly; a spring biased between the slider and the positioning assembly; a braking assembly comprising brake pad, shaft pad, plural steel balls and fluted disc, the braking assembly disposed in the slider, the brake pad corresponds to surface of the disc brake, a side surface of the shaft pad defined with plural slots, each of the plural slots formed with shallow end and deep end which used to cooperate with the steel balls respectively, a drive shaft provided at the same side of the shaft pad and rotatably protruding out of the slider, the fluted disc defined with teeth for meshing with the teeth of the positioning assembly, a side of the fluted disc formed with plural cavities for receiving the steel balls; a rock-arm assembly comprising a steel wire and a rock arm, the drive shaft of the braking assembly disposed at an end of the rock arm, the steel wire fixed to another end of the rock arm.