Buffer device of disk brake

A buffer device of a disk brake comprising:

• a cylinder;
• the cylinder being installed with at least one piston assembly;
• the piston assembly having a piston and a push cover;
• wherein
• the piston is installed at an inner side and outer side thereof, and the inner side having a receiving chamber for receiving a push cover;
• a bottom of the receiving chamber is extended upwards with an inner wall;
• an outer diameter of the push cover is slightly smaller than an inner diameter of the receiving chamber;
• the push cover has a first end and a second end;
• the second end of the push cover is corresponding to an inner side of the piston so that second end is received in the receiving chamber;
• an elastic assembly is installed between the push cover and the piston and the first end and second end of the push cover are formed as an outer wall;
• wherein since the elastic assembly is installed between the piston and the push cover, when the push cover is pushed, the elastic assembly has a buffer effect.