Mercedes Benz cars have W211 and R230 with ABS \ SBC system , if using DAS test, the instruction as follows:
TIPS：CODE C249F, OPERATION TIME OF COMPONENT A7/3 IS EXCEEDED (SBC HYDRAULIC UNIT)
The above tips that show internal fault of control unit, you have to replace the SBC control module and using W211/R230 TOOL that can be easily repaired without replace the new control module.