First Check:
Pull the front sensors and clean them..they get full of rust filings and don't give a signal at low rpm..this get mis-interpreted by ABS module as a skidding wheel and engages ABS system...very common.
If they are clean, then do an ohms test on each..the plugs are up on the inner fender well, each side..follow the cable up to the connectors.........

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A Dalton