brake problem

This is a 2002 R170 SLK32 AMG. I've just put her back on the road this afternoon after nearly six months on a SORN and I had a bit of an issue with the brakes. When first started and moved on the driveway, slow speed manoeuvring felt a bit odd, the car was reluctant to move without a prod on...

Hi I've recently just bought a used c220 from mercedes and in the last 2 weeks randomly when I am stopped in traffic with the brake on or with 'hold' on the whole car judders/wobbles??? I've read about just steering column juddering but this is the whole car!! Feels like it would be noticeable...