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Warped disc help

Hi q listers
I need some help on what I think is warped discs ( 1986 CoupeQ). When braking from say 80mph to around 55mph I get a judder through the steering wheel and a bit through the brake pedal. Below 55mph I get little or no judder at all. If a brake hard from 55mph I get little or no judder at all. Why do I get the judder at higher speed. I have replaced shocks, top mounts, bump stops , wheel bearings. A arm bushes are ok, the only other bushes I need to do are the roll bar bushes in the A arm, but I don't think this would cause the problem. Warped discs or something else? If it is warped discs any BTDT on upgrades like cross drilling and grooving.