Am getting input from 2 different sources about replacing pads. One says crack the bleeder screw, compress caliper, tighten bleeder, theory being crap in caliper will be expelled prolonging caliper life. Other says don't bother, just a risk of snapping bleeder. Have done quite a few over the last 50 years, never cracked the bleeder screw this way. Never seemed to have issues. Are there some vehicles which require this, either for crud in the caliper or upstream hydraulic issues (ABS controller, etc)?