[SteveSarre]

Hi Reise.

Is the car sitting at the correct height (the wheel arches should be a couple of centimeters above each tyre)? If one of them is much lower then maybe you have a broken spring.

When you go over a bump, is there a knock or a vibration? Is it heavy knock or a light knock?
Do you feel something through the steering wheel, or through the seat, or can you only hear it?
Which part of the car does it come from?

On your 205/55 R16 Dunlop Sport tyres what is the air pressure?

Have you looked at any of the parts that your mechanic has taken off the car? Could you see for yourself that they needed replacing?

What do the current trailing arm bushes 3516122 bushes look like? Can you see them and are they in bad condition?

Steve