Ian,
The old ABS systems that locked wheels (Maxaret) had poor dry tarmac braking abilities compared to a decent driver. Hence they never really caught on apart from commercials and aircraft, where predictability was more important than outright performance. Much better than current systems on snow and sand though...
Yes, you are using a derivative of threshold braking, but you aren't locking wheels. It looks and feels like it, because the chain chatters and the kart vibrates, but that's just because you're exploring the interface between stable and unstable slip regimes.
What you are using is more savage, but I'm pretty sure it's what I see when I look at a decent racing driver's data. The wheel speed drops sharply down from the road speed, the driver rapidly reduces brake pressure, and then rather more smoothly reapplies the brake. Ends up with brake pressure trace against distance looking like half a christmas tree lying on its side, and wheel speed looking like a downward slope with wedge shaped notches cut in it.
I know you're going to shout at me again, but I still don't think you're locking the wheels. I'd love to get hold of some data, because I'm almost certain it will be similar to a lot of data from race cars.
Notably, I [I]can[/I] lock the wheels sufficiently to disengage the clutch when braking into a hairpin in my kart, but I'm pretty sure a better driver than me would not cause this to happen.
Liam
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