Post meta empty on delete_post action

Hi,

i have custom post type, and need to clear some files created for each post when post deleted.
Links to files and other data are stored in post meta.

In callback function, registered with hook – delete_post is called – post meta in database table (~wp_postmeta) is allready deleted.
Tried to set different priority in add_action.

add_action('admin_init', 'my_admin_init');

function my_admin_init(){
  add_action('delete_post', 'my_delete_post_action', 10);
}

function my_delete_post_action($pid){

  $meta = get_post_meta($pid, 'my_post_meta', true);
}