[Rear disk brakes poor perfomance!!!]

I've passed my anual mechanical inspection. However i was told that my rear brakes' perfom poor. Any ideas what could be the culprit? I've changed everything on my front end brake system but did not change the rear hoses yet. Can this cause the rear brakes to perform poorly?

[Need bushing numbers!!!]

Good day, i am interested in bushing numbers for the rear anti roll bar on my MB3. I would like to get the real OEM article numbers, thank you