Conventional wisdom suggests that one should replace the regulator and alternator at the same time. I replaced my voltage regulator years ago without any ill effects on my alternator, but I may have just been lucky.
I must have committed an abomination. I changed out my MC & brake booster recently. I did not bench bleed the MC. Instead, I bled the MC and proceeded to bleed at the wheels. After bleeding at the wheels, I bled the MC again, just to make sure. After all, brake fluid is cheap. I ended up with a normal feel to my brakes.