Legal Question in Consumer Law in California

You haven't provided enough detail to give you a very accurate answer, but generally if you agreed to a settlement in court, and especially if that settlement was put on the record by a court reporter, you are bound by it. It forms a new contract in place of whatever you were suing about. If you don't abide by it, you are in breach of contract. If it was put on the record by the judge and a court reporter, the other side would not even have to sue for breach of the agreement. They could just go into court and have the agreement turned into a judgment directly.