2001 Toyota Tacoma Question: Why does my ABS activate every time on cold mornings when comeing to a stop?

It also comes on more when the roads are wet or snowy. Some times when the roads are dry at a slow speed when comeing to slow stop. It can be predicted sometime by feeling the peddle geting slushy..Pulls to the right every time and does it more when slowing into a right brake stop at stop signs. NO ABS LIGHT IS ON!!