What causes brake judder?

[greypianosflying]

Got a MK6 Ford Fiesta which judders slightly through the steering wheel when braking. Nothing major, just annoying.

I've checked that both front wheels are true and round by sticking a pencil to a jack stand and rotating the wheels. Hardly any deviation from the tip of wheels, 0.5mm at most. Also did the same with the disks. Everything it round and true. I checked on both sides of each wheel and disk.

No play in any bushes as far as I could tell. I grabbed the various suspension components and gave them a shake, but no movement. Drive shaft has a bit of play if you push it backwards and forwards towards the transmission, but it is the same on both sides.

Any ideas what else it could be? I did notice that the inner side of the disks were worn slightly more than the outer side. Same on both disks.

Don't think it is a tire balance issue - just had new tires put on and it is exactly the same as it was with the old tires. It seems to have a slight judder when moving normally, but gets worse when braking.

Thanks!

[greypianosflying]

Thanks for the help. Will change the disks / pads if it gets worse.

Car is on 70k with the original disks / pads. Still loads of meat left.