Could soaking a brush in too hot of water cause it to loose hair onesy twosy style. I have an AoS Pure Black Badger Brush. Are there any brushes out there that can handle hot water better?
IMHO soaking a brush is not a good thing to do. I've found that just holding the bristles under hot water for a few accomplishes the same thing as soaking, plus it doesn't subject the knot where its glued to the handle, to the possible damaging effects of the water.
But +1 to the second post. Warm water is fine, cold water is fine, HOT water is not good for any part of the brush I'd say.