My '52 plate mk4 Astra 1.6 club auto has started making a sqealing/screeching noise (almost like metal on metal) when making right turns (noise comes when making hard right turns at low speed and for less severe turns at high speed). I can't feel any problem with the brakes (braking is not asymetrical or noisy). I've heard that this could be a PAS pump problem? Does this ring any bells with anyone?
Does anyone have any other suggestions or any other tests I could do/ things I could look at to diagnose this? (I'm going to go and look under the car in a minute to check the suspension ball joints and look for any obstructions etc).