Wheel speed sensors misadjusted, damaged , or metal shavings and other debree, since they are magnetic can give false readings from one of the wheel circuits. Over sized tires can give of false speed readings as well. there are many other causes including bad relay, control module, e.t.c. It is best to have the proper scan tool to diagnose an ABS problem. There are many more reasons if the ABS pump continues to run it might have a leak, If it does not run could be a fuse or relay, stuck valve or debris pushed into the abs system when pushing the pistons in during a brake service.
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Many thanks, diagjunkie. I will work my way through your suggestions
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