How much would it cost to replace the rear pads with genuine pads?
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Had my front discs/pads replaced by a local MB indy using genuine MB items for £280 (inc. parts, labour & VAT).
Local MB dealer wanted almost £100 more for the same job!
If you got the knowledge and tools to swap discs/pads then do it yourself and save the labour costs.
I guess you looking about the same price for doing the rear discs/pads? I suggest you look at the discs for wear, as my experience with MB discs is that they are soft - you will probably end up changing the discs as well as the pads.