CA Civ Code Section 8154

(a)

A bond given under this part shall be construed most strongly against the surety and in favor of all persons for whose benefit the bond is given.

(b)

A surety is not released from liability to those for whose benefit the bond has been given by reason of a breach of the direct contract or on the part of any obligee named in the bond.

(c)

Except as otherwise provided by statute, the sole conditions of recovery on the bond are that the claimant is a person described in Article 1 (commencing with Section 8400) of Chapter 4 of Title 2, or in Section 9100, and has not been paid the full amount of the claim.