1 Introduction – 2 The Main Features of the Brazilian Consumer Protection System – 2.1 First, the Civil Law Affiliation – 2.2 Second, the Two-Tier Federative System of Courts and Statutes – 2.3 Third, the Prevalence of a Top-Down Legal and Deductive Legal Reasoning and The Constitutional Seat of Substantial and Procedural Legal Regimes in the Brazilian Civil Law – 2.4 Fourth, the Essential and Basically Unrelinquishable Principles of Consumer Protection in Brazil – 2.4.1 Public Order Nature and Non-Waivable Class Action – 2.4.2 A Comprehensive Pro-Consumer Public Policy and a Plethora of Substantial and Procedural Provisions that Presumes the Vulnerability of the Consumer and Grants It with the Fullest Possible Safeguards Against Abuse – 3 Arbitration and Consumer Protection in Brazil – 4 A Brief and Contrastive Overview of the Consumer Protection Framework and Arbitration in Mass Consumption Contracts in the U.S. – 4.1 The Main Components of the American Legal, Administrative and Institutional Consumer Protection Framework – 4.2 Administrative Agencies and Basic Set of Statutory Law Supporting their Action – 4.3 Consumer Defenses Used in Arbitration of Mass Consumption Adhesion Contracts – 5 Conclusion.