Oh - had a Volvo 345 years ago that also had similar symptoms: it was the steering house.
Mechanic said it was half full of oil (fine) - and half full of water and rust (not fine).
Which had made everything inside wear out (
Details? How long have you had the car? Any recent changes? This could be a warped rotor (possibly due to a sticking caliper), a bent wheel, or a serious suspension problem. Hopefully you aren't still driving the car.