It may or not be relevant but have noticed on my wire wheeled Roadster in heavy rain at motorway speeds, delayed braking effort and sometimes pulling to one side or the other until water cleared from disc surface by a dab or two. Was told the wires act like a fan at speed blowing water onto discs.
Yep, I get this too and have heard the same explanation. I find it's better to apply the brakes reasonably firmly, it seems to squirm less.
