hi, my rear suspension on my 520i is making a horrible noise when i go over bumbs. it bangs quite loud from both sides. you can only hear it when your inside the car. and also the suspension squeeks as it goes over bumps but if you go over a large bump for example a speed bump then it doesn't do it. just does it in the uneaven road surface. also if you have a few people in the back so the is wait on the suspension it does not squeek at all but still makes the banging noise.

please help me out as i have no idea what it can be.

thanks

p.s it is the top part of the rear suspension which is banging