| 摘要 |
A drum brake of the vehicles includes a piston seal returning piston to the original position, the assembling process is simplified, and the weight of the drum brake is lightened. A drum brake of the vehicles comprises a hydraulic cylinder(20); a shoe(40) operated with piston; a drum(30) rubbed with shoe; a piston seal is arranged inside the hydraulic cylinder and generating the force of restitution about the elastic deformation and returns piston to the original position by transforming through friction in the movement of piston.
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