i have a 1998 audi convertible and it kept pulling across the rad so i had a look around and found the following defects

both front lower arm bush's worn to excess
both track rod eads worn to excess
steering rack leaking
both suspension top mounts worn to excess

so i changed everything above but it is still doing it i have had the travking done and it has new tyres all round the car has 17x8j wheels it doesnt do it all the time only now and again but when it does it whips the steering wheel out of your hands any advice would be great