I have noticed a strange noise on my astra j. The noise sounds like when a brake disc lip may be slightly rubbing / touching the caliper. However, it is not this making the noise. The noise happens all the time. It doesnt change if i brake, turn left or right and it doesnt change with clutch or gear changes. If i push the car when it is off i can still hear it. Possibly from drive shaft area?? Has anyone else had this?