... -NPT3/85/8-11UNC120.7MM5/8-18UNC270MMINTRODUCTION: Spring duration>100,000times diaphragm duration:>1,000,000times ... the energy of compressed air or a mechanical spring, Brake Actuators provide the input force to operate ... each wheel.We offer a comprehensive range including Brake Chambers, Spring Brakes (in diaphragm/piston or double diaphragm ... ,IKARBUS,TAM,HOWO,MAN,DENNIE,RENAULT. spring brake chamber