Agreed

I had juddering when braking over 50mph and it was discs so I replaced with genuine discs and pads and it was sorted. 2009 Vogue TDV8 Nara Bronze
2002 Vogue V8 Zambezi Silver
1986 90 Pick up Deep Bronze Green
1978 Series III SWB Deep Bronze Green

check the rears for sticking calipers, the symptom is pretty hard to pin down, could be bushes, could be fronts, could be rears. If it was doing it before you changed the discs then i would check the rear end for hot discs after a run. They are notorious for sticking. sometimes caused by the pads sticking in the caliper carrier, sometimes by the actual caliper. First job is to get the carrier off clean off the rust and corrosion where the pads sit and fit some new pads and re build making sure that the pads are not tight where they sit. There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

Had this issue, rear caliper sticking.

Thanks Guys, Sounds like a big session checking everything.