I would suspect that this is the measurement of the brake rotor thickness. More than likely it is rotor thickness in millameters. Unfortunately my MB software does not give me Euro model specs so I can't be for sure if this is within spec, but I can tell you that on the US model C230 of this year (which may very well use the same rotor) the min rotor thickness is 22.0mm. This would mean you are over by 1.2mm.
June, 2, 2009 AT 10:17 PM
I agree with that. The min thickness is 22.0. You are over 1.2 so I think thats the problem. Maybe the previous owner put a brake not for that car.