Send checkbox as fix in ajax and process it codeigniter

My problem is that when sending the array with the selected checkboxes, the empty variable is received in my controller. For example, I have:

<input type='checkbox' name='valores[]' value='1' />
<input type='checkbox' name='valores[]' value='2' />
<input type='checkbox' name='valores[]' value='3' />
<input type='checkbox' name='valores[]' value='4' />

and to send it by ajax I do the following:

$.ajax({
        url:$("form").attr("action"),
        type: $("form").attr("method"),
        data:$("form").serialize(),
success:function(respuesta)
        {
        alert('Perfil creado con éxito');
        }

and in my controller I receive it in the following way:

$ids = $this->input->post('valores');

I have taken 'values' in an alert and it prints something like this: values% 5B% 5D = 1 & values% 5B% 5D = 2

Someone can tell me what I'm doing wrong, or how I can receive this data in an appropriate way to process it.