Poor quality Vacuum Pump failed, resulting in debris in crack shaft assembly and preventing brake functionality. Check engine displays and error message stated ‘Service Brake Assist’ which ds not indicate a vacuum pump failure, which is misleading in troubleshooting issue. Hard brake pedal is a symptom, which would lead a repair facility or consumer to replace Brake Power Booster, which ds not resolve issue, but will temporarily resolve brake pedal symptom, leading to further damage to crank shaft.