[Oldandslow]

when I drive in the mountains in 180* curves I sometimes use a little rear brake at the very beginning of the curve, where there is not yet a lot of traction. I don't know the logic behind that, but I think it helps me to lean faster. what do you think about that?

It's called "trail braking" and is something I do all the time. It settles the rear end, makes it squat a little, and helps with rear end traction. Get off the rear brake at the apex of the curve and get on the throttle. It's a lot of fun!