A failing OVP can intermittently illuminate the ABS light. This used to happen on my 300SEL. On my 560SL, my ABS sensors needing replacing, but I don't remember whether the ABS light was intermittent or just on all the time.
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino