Change brakes…

Hi guys, I wanted to get on the brakes at the Fiesta, it is absolutely necessary to vent the cables after you pushed the piston back and renewed the brake discs + pads? So far only the brakes have changed in a car without ABS, for brakes with ABS is not really a difference, right? Must after switching to the TüV, but have no desire for changing 250 euros to tin. Greetings