Yes I would agree with Workshop control on this, some brake squeal is acceptable but some Megane IIs & Scenic IIs have excessive squeal, My previous 05 Scenic suffred at time horrendous brake squeal this was eventually resolved by the above action mentioned by Workshop Control.
Originally Posted by Workshop Control
chris m is right - meganes are known for this, but just cleaning the brakes and lubing isn't enough. As suggested, it is actually the noise of vibration you can hear. Check what the Renault dealer really did, the 'cure' is replacing the calipers with a different design, with new pads & discs, if they havn't done this, get them to have another go.