While driving in a 35mph zone, a complete loss of braking was experienced while coming up to an intersection. The vehicle was unable to stop, not even emergency brake function worked. An independent service center did a postmortem of the brake caliper and confirmed the fastener failure of the caliper bracket. The caliper fasteners sheared off inside the caliper resulting in the caliper piston falling apart while driving. This resulted in complete brake malfunction, and brake fluid leakage. There was no warning or message for this failure. The brakes experienced complete failure without warning.