unkown problem

hello all, this is my first time ever posting to prius chat, however I am a long time lurker here. I recently bought a 2006 prius used with 100,000 miles and have been hearing a very disconcerning sound coming from underneath the car. It is a screechy noise that is always there, but especially when i accelerate or break going up a hill. I have had it checked out by both a dealership and an independent mechanic here in seattle, and neither party has any idea what it could be, even after hours of troubleshooting, as well as showing then a video in which you can hear this awful sound. Any informaion on what may be going on here would be much appreciated. I turn to prius chat because you are the biggest resource of information. Thank you for helping me fix my beloved new car. I have a video that I will try to upload but is hard because it is on my phone. i will email you the video if it doesnt work.

 

Yes, they charged me $150.

 

they said they worked on the breaks to tighten them, and they greased the axle or something thinking that would solve the noise. it didnt, but i still had to pay. I couldnt figure out how to post the noise on my phone, i will use my computer tonight when im home to upload it.