Steve,

sure enough what you said is 100% TRUE. Both systems (ABS, ASR) are NOT working. I just tested both as you suggested on a wet grass.

so that means it is a speed sensor problem, right? any idea how much it Cost for 1994 C280???

is it hard to replace? or does he have to take it to the dealership?

thanxxxxxx again, for the valuable info. I really appreciate it.