We've all had some experience with the juddering and pulling, whether it be a Mini Cooper or a go kart!

Reason

Under/over inflated tyres.
Brake Disc 'run-out'/Dirty hub mounting.
Sticking brake calipers.

Action

Check tyre pressures.
Check disc 'run-out' and hub mounting condition.
Check/service brake calipers.
Always clean the hub before installing new discs.