[Brakes] Brake judder at speed.

[polar]

By the way the MOT test won't pick up on the juddering as the brake test rollers only run at a slow speed, they more specifically check for actual braking force.

Always worth checking your wheel nuts are tight.
On one occasion after having new tyres fitted I had a strange pulsing in the brake pedal and a minor steering wheel vibration. I checked the nuts and got an extra 1/8th of a turn on them and problem solved.

A brake test will pick up a warped disc though geoff but that does not mean a fail. Only efficacy being down or a brake imbalance is a fail. But is a disc is warped it should be felt through the pedal.