Toyota Prius brakes making intermittent knocking noise after actuator replacement on Toyota Prius

Some Toyota Prius owners report experiencing intermittent knocking noises in their brakes after an actuator replacement, which could be attributed to a faulty actuator or improper installation. Additionally, some owners notice a buzzing sound every few seconds, potentially indicating a leaking brake accumulator/actuator. Others have reported a hissing sound that may signal issues with the actuator, which is vital for converting brake pedal input into hydraulic pressure. It is recommended that owners of 2010+ Prius models recalibrate the Brake Actuator Skid Control ECU to resolve actuator-related concerns. If the knocking noise persists, owners should verify the source of the sound and check for signs of hydraulic pressure malfunction, and consult a certified mechanic or dealership for proper diagnosis and resolution.