Today I worked on my abs system on my 89 740 turbo wagon.I was having a problem ,that at low spead my abs would pulsate(engage).From time to time my abs light would come on.When the abs light was on it would not pulaste at low speeds(Means the abs was off).The problem was the front wheel sensors.It only took about an hour to do both sides.When I pulled the sensors out they were absolutly full of metal shavings.If you are having the same problem i would check you sensors first.Thanks to the FAQ section it saved me a ton of money.Thanks