Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
SB-P-047527
MERCEDES: PARKTRONIC INTERMITTENTLY NOT FUNCTIONING. THE FUNCTION WORKS AGAIN AFTER A SHORT TIME OR DISTANCE. WHEN THE FOOT OPERATED PARKING BRAKE IS APPLIED, THE PARKTRONIC SYSTEM IS DEACTIVATED. IF THE FOOT OPERATED PARKING BRAKE IS ON AT THE FIRST NOTCH, THE CONTACT SWITCH MAY REACT WITH A CONSIDERATION DELAY WHEN THE PARKING BRAKE IS RELEASED. NO MODEL YEARS LISTED. *PE
TSB-42-10-109
MERCEDES: CORROSION PROTECTION COATINGS FOR BRAKE COMPONENTS AND HARDWARE MAY BE DAMAGED AND OR STRIPPED AWAY IF HIGHLY CONCENTRATED ACID BASED CLEANERS ARE USED. ONCE THE CORROSION PROTECTION IS DAMAGED OR REMOVED THE BRAKE COMPONENTS AND OR HARDWARE CAN BEGIN TO CORRODE. INCLUDE ALL MODELS AND MODEL YEARS. *PE
SB-090930
MERCEDES: THE LIMITED WARRANTY ON THE SBC HYDRAULIC UNIT FOR MODELS 211, MODEL 219 AND MODELS 230 WAS EXTENDED FROM THE ORIGINAL 4 YEARS/50,000 MILES TO 10 YEARS WITH NO MILEAGE LIMITATION. THE SBC HYDRAULIC UNIT EXTENDED LIMITED WARRANTY APPLIES TO ALL CONDITIONS THAT JUSTIFY THE REPLACEMENT OF THE SBC HYDRAULIC UNIT UNDER THE STANDARD WARRANTY TERMS AND CONDITIONS. *PE
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.