Had a days holiday so thought as it was such a nice day i'd give my brakes a good service and grease up before the winter weather kicks in.
A few hours later and i was just nipping up the the very last thing before finishing, and one of the rear pad pins wouldn't do up, it just kept rotating.
I'm a bit miffed by this as i'm not heavy handed, copper grease every bolt and use a torque wrench.
It seems the caliper thread has just given up, the pad pin thread is fine as it's a harder metal.
There was a little bit of bite there so i've Loctite'd it for the time being but it's not ideal.