Yikes, just had this happen on my 2013 981…..surely this should have been a recall? This thread is ancient so apologies but obviously problem remains. At least I’ve developed another skill , “left foot unbraking”! Wonder if Porsche will give me a set of new pads as I just thought it was electrical fault when warning appeared on dash, interestingly saying drive normally with care! If brakes binding I don’t think very normal. Chat with OPC Monday 
