Change default (side) meta-box position for taxonomy in admin (post edit) page.
function brand_categories_meta_box(){
remove_meta_box('branddiv', 'car', 'side');
add_meta_box( 'branddiv', __('Značka', 'autopredajcovia-cpts-tax'), 'post_categories_meta_box', 'car', 'normal', 'high', array( 'taxonomy' => 'brand' ));
}
add_action( 'admin_init', 'brand_categories_meta_box', 0 );