укажите возможные причины неотпуска тормозов в поезде

https://welcome.advertising.yandex.ru/direct/entry.xml?from=yasearch_button_control_promoi&id=add-n&text=%D1%83%D0%BA%D0%B0%D0%B6%D0%B8%D1%82%D0%B5%20%D0%B2%D0%BE%D0%B7%D0%BC%D0%BE%D0%B6%D0%BD%D1%8B%D0%B5%20%D0%BF%D1%80%D0%B8%D1%87%D0%B8%D0%BD%D1%8B%20%D0%BD%D0%B5%20%D0%BE%D1%82%D0%BF%D1%83%D1%81%D0%BA%D0%B0%20%D1%82%D0%BE%D1%80%D0%BC%D0%BE%D0%B7%D0%BE%D0%B2%20%D0%B2%20%D0%BF%D0%BE%D0%B5%D0%B7%D0%B4%D0%B5%20%D0%BE%D1%82%D0%B2%D0%B5%D1%82%D1%8B%20%D0%BD%D0%B0%20%D1%8D%D1%82%D0%BE%D1%82%20%D0%B2%D0%BE%D0%BF%D1%80%D0%BE%D1%81