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8CB250 pneumatic actuated drum type brake is a rubber tube type air friction brake, it is through air tube expanding to grip drum hub for stopping. There are some pieces of friction linings of each brake, so it can produce large braking torque. So it is mainly applied for hard working place.
 

This 8CB250 pneumatic actuated drum type element can be worked as clutch or brake as needed. When its installation mode different, then its working role is different, too. On the other hand, this equal Eaton Airflex combiflex element is usually matched with spider, drum and drum hub to be a complete structure for working.