Brake judder is caused by one of about 10 things
badly fitted discs,
badly fitted pads (not fully secure/mis-aligned)
dodgy spring platforms,
dodgy anti-roll bar bushes,
dodgy suspension mounts,
very bad wheel alignment,
a patch bald wheel/irregular wear causing a lump (only noticeable at very high speed or when braking to begin with,
stuffed driveshaft balance (highly unlikely)
Is the judder worse from, higher speed 60mph + or worse at lower speeds <30mph?
If it gets worse at high speeds or under heavy braking = stuffed/warped discs or incorrected fitment or hub preparation (discs not flat on the hub face - Quite a common cause of disc warping after say a few hundred to a few thousand miles) - A kwik fit speciality
If it is bad at low speed or gentle braking and gets no worse at higher speed, it is more likely to be defective suspension mounting.
Once drove a mates fiesta with brake judder that was horrific at low speed and almost went away at high speed.
one front lower suspension arm mounting had torn loose from the car and was the cause of the problem. (caused by his Girlfriend hitting a fence post which found its way off a lorry and onto an A road at 70+mph, also buckled the wheels quite thoroughly too!)
(Highest likelihood is warped discs caused by multiple heavy stops, leaving foot on foot brake after heavy stop, or sticky caliper causing heat build-up, or off course rubbish discs!)
High temps kill standard discs very fast. A set of regular discs on a fiesta RS turbo will last one track day and then be pringled!