Wonderful! So the 500's I recently bought for my long term 70's clubman's racer project are basically going to scare the living whatnot's out of me on each and every ride, as I live near the top of a hill.
Wienmann 500s are perfectly capable of locking the wheels.
Provided that the road surface is perfectly frictionless, or you have the bicycle in the work stand.
To be honest, they're not completely useless, they are light and road legal, which is why they graced so many time trial bikes back in the 80s, where stopping wasn't a huge priority. And who knows, with decent, modern brake blocks they might be better than I remember.
I was only a teenager, with a very limited number of tools, so perhaps I'd make a better job of it now, but I found them a pain to centre at the time, and I recall faffing about with them a fair bit to get them to not rub on the rims. Maybe my memory of them is worse than the reality; I've also since been spoiled by the awesome stopping power and hassle free set-up of Vs and discs.