Worpdress wp_before_admin_bar_render action not working in back office

Worpdress wp_before_admin_bar_render action not working in back office

This is working great in the front site wp admin bar:
add_action('wp_before_admin_bar_render', 'customize_admin_bar');

function customize_admin_bar() {
    global $wp_admin_bar;
    if (is_user_logged_in()) {
        if ( !is_admin()) {
          $wp_admin_bar->remove_menu('edit-profile');
          //$wp_admin_bar->remove_menu('user-info');   
          $wp_admin_bar->remove_menu('comments');
          $wp_admin_bar->remove_menu('new-media');
          $wp_admin_bar->remove_menu('new-tvr_booking');
          $wp_admin_bar->remove_menu('new-vp_orbitslides');
          $wp_admin_bar->remove_menu('orbitslider_settings');
          //$wp_admin_bar->remove_menu('site-name');
          //$wp_admin_bar->remove_menu('dashboard');
          /*$wp_admin_bar->add_menu( array(
            'id' => 'custom-account',
            'parent' => 'my-account',
            'title' => __( 'Mi cuenta'),
            'href' => '/pedidos/products-page/your-account/'
            ) );*/
        }

    }
}
but not in the wp-admin menubar, why?
Thanks