2002 Mercedes-Benz M-Class "abs esp light weak brakes" Questions

...ESP & ABS are vary complex, (not magic) quote from the servise manual. (car battery dead or disconnected?) ESP control module When ESP control module is removed / installed, do not use impact ...

...ABS, 4WD, ESP indicators on? tries to apply brake sometimes when in motion. car runs perfectly and all lights>? head lights. no weak car battery? well next step is to scan it. the ABS is first. if ...