I've just had the front pads and discs done on my W211 E220 saloon. I had new pads fitted about 3000 miles ago, and they started squeeking about 2000 miles ago. Having taken the car back to National Autocentre who did them initially, they said that the discs were 'lipped' and so causing the squeeking, and so had both pads and discs replaced at the front. The cars only done 48000, so how long should a pair of discs last, and whats the problem with 'lipped' discs. Should they have been noticed when the pads were changed? I'm wondering whther I've been ripped off here or whether they just let me down initially. Any tips or ideas?