Thanks for the info. Must be something going on with the calipers.

I replaced the rear rotors because the shop said they were being scored (as explained by the dealership). When driving at high speed I cold hear the breaks making a noise (a cavitation like sound, for lack of better word to describe it). I replaced the pads and rotors with MB dealership parts and they sounded fined, But now I think I'm hearing it again after only about 7k miles.

So there must be something going on with the calipers, but was just wondering if there was something else I should have done besides changing the pads (i.e. lubricating any moriving parts, etc.).

Also, I think I'm going to look into getting the older rotors turned as they seem to be acceptable (thickness wise).

Thanks for the info.