brake judder /pad deposits

[jimk04]

I have almost new (<6 months and little use) brakes on my S. I fitted EBC yellow front and some porterfield to rears....perhaps not the best match admittedly but I got them at a good price.

I did some stops and cool downs to bed them in.

Considering they are all new, the brakes are crap, and I must have pad deposits asbo get judder under heavy braking, and when braking in town to a halt, I can feel the retardation ebbing and flowing as the pad passes differing parts of the discs.

I dont know if it is the rears or fronts or both.

I drive hard and they do get used but they haven't seen the track yet.

Why do I have this problem?
I recently drove a box stock 2.7 with new discs and cheapo street pagid pads and the brakes were much better than mine...feel and retardation. Can't comment on heat capacity.