The ABS on my 1998 SVT Contour is not working correctly this winter (it has worked fine previously). If there is only slight slip (1 or 2 wheels), the ABS works correctly. But if there is lockup at all 4 wheels, the ABS just quits working (the lights dim a lot, too). I've measure Voltage at the battery, and had about 11.5V when this happens. The car has a new battery and new alternator - the charging system seems to be in order. There are no other electrical problems. The ABS passes the self-test on start-up, and the ABS light does not light when this error occurs. Any thoughts? The repair manual does not offer a lot of insight into the ABS unit, other than testing the relays.
