hello my s211 e320 cdi 2007 is giving me the check brake fluid level message but its topped up and i have had this problem for almost a year now.
Im wondering if it may only be the sensor in the reservoir and if you can change only the sensor and not the whole reservoir and where i can get a new one
or if anyone else have had this problem and found other causes

 

I would recommend getting it scanned(local auto parts store free of charge) then go from there. GL
R,
2Merks

 

You might also ask the dealer if they can get the sensor. Sometimes we are surprised that a problem is so common, they keep the parts in stock.