Yes, cleaned the grease off the disc both sides. Possible handbrake shoe, although handbrake working well. I am right that you adjust the handbrake through one wheel nut hole, seems impossible but everything I. Read seems to suggest that?
As an aside I have been advised to go through this procedure ...

Spent the weekend fitting new rear Pagid discs and pads to my 2004 x3 3 litre auto. On one side the originals had been badly scored by a stone or piece of grit. The fittement was quite easy although I had not come across the back soft lining on the disc pads before and had to look check online to ...

Thanks for the confirmation, as you suggested the size of the tyre has more depth so the overall size looks close to 18 inch.
I am pleased I have a spare rather than the inflation kit, but it's a great shame that the carrier is not waterproof. The spare suffers from water exposure and could do with ...

Recently brought a 2004 X3 3.0i Auto sport with only 39000 confirmed mileage. Very pleased so far but have query over emergency spare stored under the rear. The car tyres, which I presume are as original are 18 inch, but the light weight spare is only 17 inch. Having read a lot of buff on the ...