Had my 99 s3 since 26k, about to hit 100k and 2 days ago a nasty knocking noise has appeared and I need some help as its getting worse rapidly. The front ARB and wishbone bushes were replaced at 70k but everything else is standard and original. I checked the front and rear arbs this evening and all bushes look fine. The rear arb is very rusty and realise this can crack the collar inside the bush, but the front arb is still looking pretty uncorroded.
Knock feels like it is coming from below the drivers seat or towards the back of the car when going over smallish holes in the road. Even though the knock sounds like it is from the middle/ rear of the car the noise happens when the front wheels hit a pot hole....
Looking at the top mounts, when the car is on the ground there is an 8-10mm gap between the body and the top cap. Guessing top mounts need replacing but is this enough to cause the knocking?
What are the first things i should replace?