As someone previously mentioned, brake pads are (usually) an easy DIY replacement on Mercedes.
One caution - harder aftermarket pads will probably stop just fine but may cause more rotor wear and/or brake noise. I try to use
OE or factory brand pads on these cars, even getting them from the dealer, if no one else has them. Most people hate sqealing brakes!

Happy Motoring, Mark

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DrDKW