I am having another issue with my Vectra (04 Diesel)

If i break quite hard'ish when going round the corner, the steering is locking until I release the brake then I can steer the car again... this happens more when I steer/turn towards the left, never happens at full speed or obviously straight line, I am also getting a slight wheel wobble at 60 (but I am assuming thats a wheel balance issue)

The only other I get first thing in the morning (I live in a square - well, oval type shape) is that when I start driving round it, there appears to be a grating/grinding noise coming from passenger side front... after I then, I turn right to get out of the square, I don't hear it again then...

I plan do the CV joint test later in tesco when its empty.

Am I doomed?