The contact owns a 2019 Toyota Rav4 Hybrid. The contact stated while driving at an undisclosed speed, the contact discovered that an unknown fluid was leaking behind the brake pedal. No warning light was illuminated. The vehicle was taken to a dealer where it was diagnosed and determined that brake fluid was leaking and that the brake booster pump needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure. The failure mileage was approximately 54,000.