Yes sorry, should have said that, front calliper. Sounds likes its nothing to worry about, so will leave them as it is. There was enough room for play between the calliper, pad and disc so shouldnt get stuck again, just wasnt as much room as the other one in the pain of pads. Definately was oxidation under the pad stop that caused it, when I got rid of it, it fit so much easier. Dont know how Nissan changed it last time, unless its happened more recently as I couldnt get the old pad out it was that tight!
Ho hum, live and learn. New disc and pads are working just fine, shame its wet so I cant go for a real play
Thanks for all the help