I installed the right front wheel speed sensor today. No improvement in the Bas light. Some had suggested pulling fuse 2 inside the car to clean any oxidation. Did that, no improvement. So other said pull the wiring plug on the ABS module and clean that. I did. No improvement. I am awaiting a new brake light switch to see if that helps. Brake lights do work, but some say it still can be a problem. Ordered rear wheel sensors. Once the brake switch and rear sensors are replaced, I will be out of ideas, at least until I get the codes read. Or might be best to buy a code reader that works with these orphan cars.
No Mercedes friendly shops anywhere near me that I know of so might be a good idea to have my own code reader..