Hey everyone, my new daily driver has some rather dangerous problems that I really need to fix but haven't been able to figure out what's causing them. Anyone care to take a crack?

Problem 1: The steering feels very light/loose/easy to turn and mainly erratic. The car seems to track into every bump/dip/uneven surface on the road and when this happens the wheel jolts violently, I have to keep a hold of the wheel at all times or the car would loose control, like a bicycle basically, it's ultra sensitive and dangerous. The tie rod ends, k frame bushes, radius rod bushes have all just been replaced and it's still not fixed. Ball joints were also done not long ago. The steering is tight can't find any movement in parts, knocks, rattles.

Problem 2 : The brakes are very bad, despite bleeding the system, new rear rotors (front rotors machined and new pads all round). The car just doesn't seem to stop instantly, like the car throws itself forwards as though the momentum isn't controlled. They also lock up extremely easy (and the car is ABS???) not to mention the pedal doesn't really have much give/leniancy, you push the pedal in more and the brakes don't really "increase" if you get me.

Problem 3: Every time the car goes over a drop/dip in the road, a large rubbing noise comes from the rear suspension.

If any one has any ideas feel free to let me know!!