Here is an update. I changed the ABS pump unit, with a used one from EBay. Worked great, easy install. The light is out.
I took apart the old unit to see if I could see why it failed. Inside I found small black pieces of something in the brake fluid. The pieces could be rubber from the brake line hoses. I also found that some of the brake fluid had a viscosity of jello, very strange.
I highly recommend changing your brake fluid annually.
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1989 420 SEL
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