The 5028-CM brake caliper is operated by a heavy duty industrial type dual-function brake actuator which can provide reliability and precision in any braking operation.

In the upper chamber of the actuator pot, air pressure is required to overcome the spring pressure to put the brake into a released position. In the absence of air pressure, the spring will provide the necessary force for emergency braking. The upper spring can only provide slightly more than half of the brake force.

In the lower portion, modulated air pressure is applied to the diaphragm against a light spring for the normal braking action. The combination of these actions results in a sensitive and precise braking operation on varying control air pressures. The wedge mechanism consists of a wedge and rollers that force the levers apart thus applying pressure to the brake disc and give a very accurate control over the brake torque.