I have just fitted grooved discs and ebc greenstuff pads to my 156 - the brakes are brilliant, and they are not even bedded in, I have only done 35 miles on them. The only problem is they are squeeling - really badly!!! It is worse than when your teacher used to drag her nails down the blackboard to get your attention !!! When I fitted them a put copper grease on the backs of the pads to try and stop this from happening - could this be just because they are new and need bedding i for quite some time - the greenstuff pads are very abbrasive !! Please advise or give me your comments !!