| 摘要 |
An actuator for a hydraulic brake system of bicycle includes a box having a chamber and a passage which communicates with the a chamber. Hydraulic oil is filled in the chamber and the passage. A piston is movably inserted into the a chamber and a brake cable is fixedly connected to the piston. The passage is connected with a brake mechanism so that when pulling a brake lever to pull the brake cable, the piston is moved to push the hydraulic oil to the passage to actuate the brake mechanism. A spring is biased between the piston and an inside defining the chamber if the box is connected to the brake lever. The piston will be back to its original position by the spring when releasing the brake lever.
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