Visual Inspection
WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1999 Mercedes-Benz SLK230, 1999 Mercedes-Benz ML430, 1999 Mercedes-Benz ML320, 1999 Mercedes-Benz E430, and 1999 Mercedes-Benz E320. However, it is still accessible from the selected car via links, so may be relevant.
Perform a comprehensive visual inspection of system components which could create an apparent anti-lock system malfunction. Performing visual inspection before diagnosing specific symptoms may isolate a simple failure.