Upgrade Brake Master Cylinder

[Mux213]

I do keep feeling this is a damn cool site. http://www.howstuffworks.com

This is about the master brake cylinder:
http://auto.howstuffworks.com/master-brake.htm

This is about the brake booster:
http://auto.howstuffworks.com/power-brake.htm

Reading this I have to agree that changing the master brake cylinder most likely will do jack shit. It would only do you any good if its leaking or something.

The brake booster on the other hand, thats the bit where extra braking power can be gained. First the big question is if the brake booster on a 23 year old hachi still works good. If its loosing vacuum somewhere it will deminish in strenght. But also the size of the brake booster effects how well it helps the braking.

A bigger brake booster, or a 2 membrame booster (basically two boosters stacked ontop of eachother) will increase the area on which the vacuum has effect meaning there is more force going into the brake system. Atleast thats the theory for asfar as I've understood it and seeing I know jack shit about this, I'm probably overlooking something