why does the ABS sometimes turns on? Sometimes I turn engine off it turns off. on 1997 Ford E-150

The differential looks like there is a leak?

Asked by for the 1997 Ford E-150
just out of the cover or. post more info so we can help
out/bottom of cover. Does this relate to ABS coming on?
okay remove the cover. scrape gasket and refill. note of caution some people will tell you you don't need limited slip additive if you use synthetic. not true. as far as abs not likely. probably a dirty hub assembly speed sensor at one of more of the hub assemblies
thanks.....guess i need to find out all the hub assemblies.
forgot to tell you use ultra blue gasket silicone on the differential cover.