Maybe the lower arm, or antiroll bar bushes for the skittishness mate, mine are fecked and any bit of rough road makes the car feel like a pram on cobbles! It hops and wibbles al over the place, but still corners ok on a smooth road.
The brake pressure varying could be a loose caliper, sticking caliper, intermittent air-leak to the brake servo (or blocked servo valve) or an ABS fault.
The steering thing could be a loose pump or broken bracket causing the pump to swing right during left turns, taking tension off the belt and hence no ps? Just guessing here tho - weird fault.
I dont think the three things are the same fault but may be related in some way tho I suppose :O)