If you are on county parole or probation and your probation officer has reason to believe you have violated the terms of probation, the officer may request the court to place a detainer on you. This means that if you are not in custody, a warrant will be issued for your arrest and you will be taken into custody.
Additionally, if you are arrested and charged with committing a new offense, that alone is considered a technical violation of probation or parole. The judge overseeing your probation or parole will likely lodge a detainer. In some cases, the issuance of a detainer is automatic and the judge may not know about the detainer or how you were managing your life prior to your current situation. Even if you are able to raise bail for the new offense, as long as the detainer is in place, you cannot be released. The only way to gain your freedom is to petition the court and ask for the detainer to be lifted.