The car will brake properly in a emergency situation with the soft pedal feel, i have had this situation happen to me. I believe there is a fix for this on a mb forum page, i read you have to remove the pads, put a block in the caliper that is thinner(almost to the point that the caliper pistons will come out of their bores, but dont let them come out) press the brake, the pistons move out, then you loosen the brake line, remove the block from the caliper, push pistons in JUST far enough to get the pads in(and the spacing between pads needs to be just enough to slip onto the rotors, do not push the pistons all the way back in or you'll be right where you started) tighten brake line, clean up fluid that came out. I DO NOT KNOW IF THIS PROCESS WILL WORK AS I HAVE NOT TRIED IT YET!, it's just what i read, they went on to say that it feels like air in the line, but it isnt, its a seal that moves when you push the pistons in all the way and you dont loosen the brake line. Hope this helps, as i said it's just what i read