Questão jurídica principal
Whether the bank could pursue the surety under Art. 496 CO without first validly summoning the principal debtor
Decisão extraída
No. The creditor must, as a rule, have first summoned the principal debtor after maturity and before proceeding against the surety; that requirement was not met here.
Fundamentação extraída
Art. 496 al. 1 CO requires qualified delay of the principal debtor and a prior, unsuccessful summons before the surety is pursued. The safeguard is mandatory and must exist before any step against the surety.