If you are using a badger brush, there are twq things to avoid. First, never leave soap residue in the brush, but rinse it thoroughly after use. Residual soap will dry out the bristles, thus making them brittle. Second, never apply pressure, lest the tips wil break. Additionally, pressure will push lather into the knot, where it is a) useless and b) hard to remove. A well soaked, high quality brush needs no pressure.