My new to me 3200GT has a brake judder issue. Its not so bad that I cant use the car, but I'd like to fix it. The brake disks where all replaced in a previous service (about 3000 miles go) However the car really has hardly been used since then. I'm guessing its probably lack of use and maybe the pads are the issue. Looking for advice if this is a common issue? I should be able to rig up a dial gauge to check if the disks are true. So any help appreciated.