Hi All I have just bought a 2015 E220 Bluetec. Up to now seems a lovely car and a great drive. What I have noticed that in full lock I occasionally get a strange noise. a cross between a squeal and a grinding noise. Not sure of the cause. could it possibly be brakes catching a bit? does not happen all the time and I have only done 100 miles since picking it up from the dealer. Any ideas what could cause this?