I'd rather not try to lock up the brakes on gravel, I don't want to get a ticket for reckless driving....what I did do was jack up the rear wheels and get them spinning at about 20 mph and depress the brakes and there is a pulsating feeling on the pedal that does not allow me to fully depress the brake it feels like. So I'm guessing that is the abs system working, correct? I had that same pulsating when I was caught in a random snow storm driving up a mountain when I tried to brake. If the abs is working, could there still be fault with the wiring?

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1990 190E 3.0L