Noises: "Boing" and "Errrrrrrrr"

When I drive and turn the steering wheel, left or right, I hear a loud “boing” sound…like a huge metal spring making a “boing” sound.

The other noise is when I slow down to a stop or park the car…the front end (like the brakes…make an embarassing loud screeching “Errrrrr” sound. The local repair shop says the brake pads are down only 1/2 and ok. I don’t trust these guys. Something is wrong. No car should be making these sounds.