breadcrumb woocommerce

Hi

i ‘m trying to redefine the breaadcrumb for woocommerce shop and product page
hence i try to remove the existing filter and adding my custom filter.
but nothing is happening, the old filter is still running and my custom filter does not run

is it the correct way to this :
remove_filter(‘avia_breadcrumbs_trail’, ‘avia_woocommerce_breadcrumb’);
add_filter(‘avia_breadcrumbs_trail’, array(&$this,’custom_woocommerce_breadcrumb’), 10, 2);

thanks