My S2 has an annoying problem at the moment. When cold the brakes operate without judder or anything. Once I've given the car a bit of stick though when I apply the brakes the steering wheel feels like it's going to leap out of my hands it vibrates so much. Also the steering seems to get heavier which I am assuming is connected.

The brakes are ST170 and the ABS has been removed. Any ideas as the car is due on track at Ford Fair and I'm a bit relluctant to take it out like this?