lol... despite the name, it is referring literally to the car rolling over, not slight undulations in the road at speed. In those conditions the arb is either doing absolutely nothing, or twisting ever so slightly (but nowhere near enough to induce instability). It is there for cornering purposes, i.e. to stop the car rolling over.
Yeah, I agree. That is what I meant really. Whilst driving in a straight line or bumpy road conditions the ARB, as you say, does absolutely nothing.
In bumpy conditions it is the suspension that should be working.
The ARB is simply to limit roll whilst cornering & to try to keep the car as level as possible.
I know before I replaced mine, when on a straight road, fine no problems, but when you threw her into a corner at highish speed, she did feel very unstable, but mine were hanging in her & completely rubbish.
I think you even commented on it in one of my posts.