Toyota reports that 2004-07 Prius hybrid models may produce a squeaking sound whenever the brake pedal is applied or released. According to the car maker, the noise is most obvious when the key is in the ready mode and the vehicle not moving. It is likely due to a defective ABS brake actuator. A new-design actuator is available to address the concern.
Before ordering the new actuator, however, bleed the brake system. If the noise goes away, you're done with the fix. If the noise remains after the bleeding procedure, go ahead and replace the actuator with the upgraded design. Order part No. 44500-47090 for 2004-05 models; or part No. 44500-47140 for 2006-07 vehicles.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].