(EN) In a brake actuator including a plurality of actuator housing portions, a diaphragm seal, partially delimiting a parking brake de-actuation chamber, is retained between adjacent actuator housing portions, and an elastic element disposed between the diaphragm seal and one of the housing portions opposes expansion of the parking brake de-actuation chamber. Upon depressurization of the parking brake de-actuation chamber, a push rod extending through the parking brake de-actuation chamber produces brake actuation. The push rod extends into and out of a service brake actuation chamber upon respective release of fluid pressure from the parking brake de-actuation chamber and supply of fluid pressure to the parking brake de-actuation chamber, and a piston, which is secured to and movable together with both the push rod and the diaphragm seal, acts as a seat for the elastic element.
(ZH) 一种制动驱动器，包括多个驱动器壳体部分，部分地限定驻车制动释放驱动腔室，并且保持在相邻驱动器壳体部分之间的隔膜密封件，和设置在隔膜密封件和一个壳体部分之间以对抗驻车制动释放驱动腔室的扩张的弹性元件。当驻车制动释放驱动腔室被卸压时，推杆通过驻车制动释放驱动腔室延伸并执行制动驱动。当流体压力从驻车制动释放驱动腔室释放时和当流体压力供应到驻车制动释放驱动腔室时，推杆分别伸入行车制动驱动腔室和从行车制动驱动腔室伸出，并且活塞作为用于弹性元件的支座，该活塞固定到推杆和隔膜密封件，并且能够与推杆和隔膜密封件一起移动。
