Could be, but probably worth just riding it out and it will become more obvious over time what the fault is. Callipers are expensive and you should only need to replace if and when the capiler seals go.
I had a strange vibration front the front from getting my Ceed at tickover than went through the car, a lot of searching lead to a vibrating undertray that has now been wedged with foam to stop it making a noise.
Sorry not much use I know.