... in truck,heavy-duty truck,trailer,specail-purpose vehicle,e double brake chamber TYPE: 30/30STROKE: 64/64PORT THREAD: ... including Brake Chambers, Spring Brakes (in diaphragm/piston or double diaphragm configuration), and remotely mounted Spring Brakes. This, combined ... and parking force requirements whether for cam, wedge or disc brake installations.ZHEJIANG ZHONGDUN MACHINERY CO., LTD specialized in ...