Save selectlist value (taxonomy) in wp:wp_set_object_terms

solved it so:

$part_brand = get_terms('brands', 'hide_empty=0');
<label for="part_brand">Бренд</label>
  <select name="part_brand" id='part_brand'>
          <option value=""
          <?php
  **$brand_names = wp_get_object_terms($post->ID, 'brands');**
  if (!count($brand_names)) echo "selected"; ?>>None</option>
          <?php
  foreach($part_brand as $brand)
  {
    if (!is_wp_error($brand_names) && !empty($brand_names) && !strcmp($brand->slug, $brand_names[0]->slug)) echo "<option value="" . $brand->slug . "" selected>" . $brand->name . "</option>\n";
    else echo "<option value="" . $brand->slug . "">" . $brand->name . "</option>\n";
  }

?>
  </select>