My early 2014 l/c gsa has been slightly binding on the rear wheel now and then. Noticed when pushing bike backwards into parking bay. Shit salt says I to myself I'll sort it tonight. Long story short calliper is free but freed it anyway. Went to pump out pistons to bring pads back out to position and pedal is not lifting. I have to lift it. Return spring is there. Anyone come across this? JJH