Whats the deal with fitting a newage brake master cylinder to a 1997 JDM STi?

I have read about different bore sizes but not so sure how this will effect the braking.

The car is running standard 4 pots on the front and standard on the rear.

However, I think my brake master cylinder is funked as I have to press the brake pedal twice to get any feel from the pedal, break fluid has been bled and changed for fresh fluid, still no difference.

But I was thinking that if I am going to change the master cylinder then why not put a newage one on there.

Question is will it fit straight on without too much hassle?

 

Anyone have any information on this?

 

as you have said its the bore size that needs to be compatible or the volume of fluid to be moved by the pedal will be diffent if the bore sizes are not the same.
Dont know who would have details of bore size. Try asking David at API he's very knowledgeable.