Remember the Mclaren in the late 90s / early 00s, it had an ingenious design idea of having a third pedal. Ferrari became aware of this, complained and had it out lawed – just like Ferrari do, don`t rise to the technical challenge, just use their power to stop it.
Why / what technical reason did they and the FIA come up with to ban it ?
Could it be reintroduced, with modifications to make it legal / conform to the rules?
It was a second brake pedal which allowed the drivers (Hakkinen and Coulthard) to apply braking force to wheels individually (effectively a manual traction control).
I think that it was a photographer from F1 racing spotted that, unusually, the brake discs of the McLarens were glowing through fast corners which would under normal circumstances be flat-out. After waiting most of the season to get his chance, when Hakkinen’s engine expired, the guy took his chance and poked his camera inside the McLaren’s cockpit and discovered an additional pedal.
Following publication of the pictures, Charlie Whiting and the FIA were pretty prompt in pointing out to McLaren that the third pedal was technically illegal.
Williams and Jordan also had a rear wheel braking system in place when it was banned. I can’t see it being reintroduced because FIA don’t like to see too high cornering speeds. McLaren still like the idea though and stick a similar system on their road car.