Well they don't really lock up, but it's a fine line, it's hard to brake smoothly with it, although it does feel like one of the rear ones is stuck almost always. And one of the front ones makes a rubbing sound when applied. I might just need new brakes all the way around.
Yah I had an issue with a bad caliper that did that you had to pump the brakes to get anything. Just search hydroboost with me as the poster.