Code of Civil Procedure § 996.330
ARTICLE 13. Cancellation of Bond or Withdrawal of Sureties
Cancellation or withdrawal of a surety is effective at the earliest of the following times:
(a) Thirty days after notice of cancellation or withdrawal is given.
(b) If a new surety is substituted for the original surety, the date the substitution becomes effective.
(c) If a new bond is given, the date the new bond becomes effective.