To uncheck radio button, you may use .removeAttr or .attr
$("input:radio").attr("checked", false); //with id $("input#id_of_button").attr("checked", false); //or $("#id_of_button").attr("checked", false);
Or using .removeAttr
$("input:radio").removeAttr("checked"); //with id $("input#id_of_button").removeAttr("checked"); //or $("#id_of_button").removeAttr("checked");
To checked a radio button, view this post
What do you think?