vroecker

The attention light for ABS comes on. I had the master brake cylinder replaced. The light still comes on, and the speedometer goes to zero when the light comes on. Any ideas?

RajDatta

Sounds like a sensor problem. You can try swapping your sensor with a known good one. Sounds electrical.
Raj

vroecker

I don't work on the car myself. What sensor are you referring to?

Dave in Chicago

Check your fuse or relay (fuse, IIRC) for the ABS. Can't remember which it is (they're labeled under the panel cover), but I have a reset button to that fuse in my dash (track need). When I reset it (cut that fuse circuit), my speedo goes to zero too. Comes back with completed circuit and the ABS light goes back off.

I think you have a fuse loose.