Synchronously driven brake

A synchronously driven brake, comprising a balancing frame configured to be connected with a brake cable and driven by the brake cable, wherein a pull cable is connected to the balancing frame and connected with two cable locking members, and configured to apply a same force to the two cable locking members;

• braking portions driven by the two cable locking members to move and press against a wheel rim to decelerate the wheel rim are respectively connected to the two cable locking members;
• and
• the synchronously driven brake further comprises restoring portions applying to the braking portions a force enabling the braking portions to move away from the wheel rim, wherein the restoring portions are in one-to-one correspondence to the braking portions, and the restoring portions keep the pull cable and the balancing frame connected with the brake cable in a tensioned state;
• the braking portions are moved toward a tangential direction of the wheel rim when a bicycle body moves forward;
• and
• a sliding direction of the braking portions is oblique to an axial direction of the wheel rim, and the braking portions are moved toward a forward direction of the wheel rim when the bicycle body is moved forward;
• a pull rod that is fixedly connected to a guide base is fixedly connected to the two cable locking members;
• a wheel gear is fixedly provided on the pull rod;
• and a rack meshing with the wheel gear when the braking portions move is fixedly provided on the braking portions.