should i get a new booster if i get a new brake mc?

 

if you're just replacing it w/ a new one (same type) and you know that youre booster is in good condition, you dont have to replace it.

 

whats the reason for replacing the master cylinder, usually the brake booster does not have to be replaced unless you have to apply a great amount of force to move the pedal. As long as your pedal has a free range of motion with little effort your booster is probably fine and doesn't need replacement. If you are getting a new MC make sure you take the time to bleed you entire system well before putting it on the road.